My Treo 650 is Driving My Coworkers Crazy!

I've got the same noise. Cingular Treo 650.

It's not just the Treo, almost every GSM phone operating on a 850 MHz network causes speakers, radios, speakerphones and older CRT monitors to freak out. The only solution I've found is to move away from these appliances (the buzzing sound isn't as loud from 4-5 ft away)

My Sony Ericson 610 does the same thing. If I have it near my portable radio or TV, it makes the intermittent buzzing/clicking sounds every few minutes/seconds.

It's not just 850 MHz GSM phones and in fact any time division RF interface, such as TDMA. The "noise" you are hearing is common and "normal" for all GSM platforms. GSM employs frequency hopping and time slotting to minimize co-channel interference and data corruption. GSM phones transmit about 1/8 of a time slot, the constant "on" and "off" transmission creates that pulsing noise you hear on nearby equipment, the effect is worse than TDMA and caused by the frequency hopping technique. The reason you hear or see those pulsating noise is because that the affected equipment is poorly shielded. The "noise" can get even louder if you have a weak signal (either because you are far from the nearest site or you have other GSM phones transmitting on the same range of frequencies nearby) which cause the phone to increase tx power. This should all get better as GSM move on the next generation OTA interface which transmit the call differently.

yep -- my blackberry phone does it also

My Motorola V551 does it as well

I actually used this. Whenever I'd forget to turn my phone (Nokia TMDA) back to Normal from Meeting, the monitor would buzz to let me know I had a call coming in.

My 6315 HP IPAQ Phone (850/1900) does it as well
So does my wife's MPX200 which does not have the 850 band, only 1900

I have several ATT and Cingular wireless data cards, and EVERY one makes that noise in just about any and all speakers near it. This includes my telephone handset. But mainly it is my radio and PC speakers.

Analog phones did this as well. But, as stated above, GSM phones also interfere with speakers and CRTs.

i don't have this problem. i, um, just wanted to contribute some text to this page.

no reason.

just bored at work.

From everyone else's feedback, it seems to be a GSM issue for we Treo owners. I have a Treo 600 on TMobile. When I'm driving in my car, this happens. But only when I'm using my IPod + ITrip (FM xmitr). The ITrip seems to pick up the GSM signal whenever the phone's trying to find a tower as I drive through weak/dead zones. But if the IPod's off, no buzz. Crazy, huh?

This is happening to someone I work with, but he has Nextel.

i would think that the FCC would put treo and some others in Violation of standards for these appliyances!>>QUOTE: FCC RULE
"# This device may not cause harmful interference and
# This device must accept any interference received, including interference that may cause undesired operation.
THE public has a right and duty to report this type of problem to the FCC.

The interference from GSM and TDMA is often both radio frequency (RF) and electromagnetic (EMI). An alternating current is induced in the wires of the GSM or TDMA phone due to the alternating draw on the battery and will create EMI if no magnetic cancellation techniques are used inside the phone. CDMA (Code Division Multiple Access) phones are more consistent in their power requirements.

What's required to shield against RF and EMI is quite different. Phones willl also be quite different in whether they're designed to reduce the EMI generated by the battery; many phones have not been well-designed in this respect.

GSM and TDMA phones will also often cause interference with older hearing aids; someone wearing a hearing aid next to a GSM phone can suddenly get inteference right inside the hearing aid. Newer hearing aids tend to be immunized against the RF interference, but not against EMI. Thus people who wear older hearing aids will tend to have much fewer problems with CDMA phones, which don't generate so much RF interference (but which may still generate EMI through electromagnetically noisy backlights or other components). Hearing aid users who use the telecoils on the hearing aids (which help them avoid hearing background noise) will definitely need to avoid phones that cause EMI. Also, people who live with users of hearing aids might want to evaluate whether their cell phones cause interference for them, and to shop for new phones with them. (It can be a real problem in the car since the hearing aid user can't distance himself or herself from the cell phone.)

sounds like a new market here for 'cellphone shielded loudspeakers'... I suspect that the interference is probably picked up at least as much in the wiring to the speakers, so we need to switch out all our wiring, too. Ah the bliss of new technology...solve problems to create new ones.

PS - This thread has been helpful. I junked my last loudspeakers because I thought they were at fault, and I have a Blackberry, too.

How about the new razor? The other night while on the home phone, I made a call on my razor. I got alot of clicking and buzzing.

I have an older Nokia 3650 with T-Mobile service and when the phone is receiving a call and I have placed it near my computer speakers, I too hear the buzz and clicking. I now use a Bluetooth headset, but keep the phone away when I am on my computer.

Back when i had Nextel and an old Motorola i550, it would do the same thing when i was about to recieve a call. It was kinda funny when i was in a crappy danceclub up near the DJ oh what fun.

Really hope this problem doesn't affect pacemakers...or other such devices.

weird

use a earphone you will feel better

What I find most curious about this is that the editor-in-chief of PC World didn't have a clue. Hmmm...

My nextel non-gps phone does this as well - anytime it checks for new vm or a call is about to come in

My nextel non-gsm phone does this as well - anytime it checks for new vm or a call is about to come in

All GSM phones do this - they will do it when they are sending or receiving data (whether this is pure data, voice or network management traffic). I guess this may be more apparent than with analogue phones because GSM data is send in short bursts rather than as an analogue stream.

Here in Europe where we are all GSM, you just get used to it...

Cheers,

Bids.

My Sprint CDMA Treo 650 does not cause the objectionable side effects you describe.

i have a nokia 6620 now and i dont have that buzz problem when i get a call. i use my handset as a bluetooth modem for my notebook so its allways ciose.I had the problem with my treo 600 when getting voice calls

My Sony stereo buzzes annoyingly about 10 seconds before I get a call on my Cingular cell phone! I have to turn the stereo off while making a call because the buzzing is so loud. It is not just Treos.

most cellphone users i know can tell when they are getting a call before they hear the phone ring just by the reaction of a nearby pc. In some cases a buzzing sound fron speakers or horizontal lines on the monitors or both. I think its a pc reaction to the rf signals that the phones use and it varies with handset

thats normal for most gsm phones including all nokia and siemens, my problem with the treo 650 switching between certain applications can take forever. also it reboots itself often after you have transferred files or software from your desktop, the lack of wifi in this model is not what you would have expected. treo users will find the new o2 XDA or o2 mini much more faster and reliable, and they include wifi

I currently use a Verizon CDMA phone, and don't have any of these annoying effects. That is, unless any of my friends are around, who are all using Nokia phones on a Cingular GSM network. I can't stand it! And it's the main thing that's kept me from switching over, even though with Cingular I'd basically be talking in-network to all my friends for free.

I also use this noice as a call coming in notice. I usually turn the ringer off when im in the office (Lipps INC "Funkytown" doesnt bide well with the CEOs for some reason) SO i use the noise to my advantage.

hi
i have treo 600 it started having buzzing noise,so i got replaced through warranty,now the warraanty one also makes the buzzing noise,i can;t even make or take call,it is all buzzzzzzzzzzzzzzzing,this is really annyoing,

i find that this was never really an issue until my phone switched from ATT to Cingular. They had to change frequencies they are running on. It is a poor excuse to blame every other devices such as speakers etc.

I have a 6620 Nokia AND it is THE WORST among any that I have run accross.

1. I use AT&T (Cingular)
2. It happens in my music studio despite that I have high end audio monitors connected to a Digidesign interface that connects to the PC via USB and high end shielded cables.
Most people I know with Nokias have this problem to some extent but my daughter's low end Nokia phone doesn't...
Happens on incoming calls but after AT Cellular it happens randomly too...

go figure - so now we all know it happens

anyone else besides me feel it is utterly unacceptable?

It happens to me with my Nokia 3120!

It will actually shut off my alarm clock if it is on when the inteference happens!

I am annoyed by this... I wish I would've known about this before I switched.

"What I find most curious about this is that the editor-in-chief of PC World didn't have a clue. Hmmm..."

Yes, that is rather odd, isn't it?
I'm a simple ducted airconditioning installer (now retired) who has never owned a mobile phone in his life, but I've known for years that mobiles interfere with speakers and amplifiers if the phone gets too close.

It's one of the reasons I have grown to hate mobile phones with a passion. They are one of the biggest public annoyances it has been my displeasure to encounter. They are only good for distracting and interrupting people - and that is truly what should be considered unacceptable.

I wonder if any of you have stood in a room full of people who have lost the art of normal conversation, but instead sit around like e-zombies txting each other? I have, it's scary and stupid at the same time. I actually considered praying for an EMP to hit the building.

Welcome to my world, technophiles. I would consider it justice if the noises get worse until your fancy overpriced mobile poser toys annoy you as badly as they do me. :P

I just replaced a mobile on Cingular with the Razr V3 in hopes of getting rid of that annoying interfernce that we all speak of here, but to my disgust, it is still there. I too am becoming the annoyance of my office neighbors, as my I work for a television station, and almost everyone has a television in their office. My Razr is causing GSM interference on all the televisions anywhere near me, even if they are turned off! Even though I really like the Razr, I was hoping it would help with this problem... however, it didn't.

Anyone I can do to make this interference less?

I just replaced a mobile on Cingular with the Razr V3 in hopes of getting rid of that annoying interfernce that we all speak of here, but to my disgust, it is still there. I too am becoming the annoyance of my office neighbors, as my I work for a television station, and almost everyone has a television in their office. My Razr is causing GSM interference on all the televisions anywhere near me, even if they are turned off! Even though I really like the Razr, I was hoping it would help with this problem... however, it didn't.

Anyone I can do to make this interference less?

Try aluminum foil--
I used it in my dorm when this happened with my T610 (GSM) and my PC speakers, and a few layers of foil around the back of the speakers made life much more pleasant for me and my roommate. Keeps the aliens from reading your speakers thoughts, too.

anyone try using the metal (aluminum) case for the 650?

I just switched from a 3-year-old Cingular/Nokia phone to a new Nokia GSM something-or-other. I needed more minutes only - was happy with the old phone - but Cingular said I couldn't upgrade the plan without getting a new phone. The only good thing about the new phone is that it's much lighter weight. And it was free (except for the 2-year contract).

Now, I get that interference every hour or so, even if no call is coming in - maybe it's my phone connecting with the mother ship....

(cue Twilight Zone music: Doo-doo-doo-doo Doo-doo-doo-doo)

Called Cingular, they said it was my Treo 600. Called Palm... they said it was a Cingular network problem. Had the same runaround with Comcast vs. Hardware. Blamed each other. Kids....give them some milk and cookies and they will still not admit they are not telling the truth. Cheers to them ALL with a glass of milk.

I've noticed this phenomenon about 4 or 5 years ago with my Nokia phone. I've always had Cingular. I now own a Sony Ericsson 616 and the same interference still happens.

I have A nokia 6010and before that a 3500 series . It was with AT&T and now with Cinular. Doesn't matter if a got a call or not it's broaedcasting the noise over speakers etc

Nokia 6010, Sanyo (unknown model), and LG 1400--all with Cingular and all have the "galloping buzz" around anything electronic; such as TV's, PC speakers, clock radios, etc.

Unlike most others, though, we love the coverage Cingular offers in our very rural community! The plans are generous with minutes and reasonably priced.

I have a Verizon phone and it does the same thing, especially when I am working on my laptop. When I have my phone away from my PC at a certain distance it doesn't buzz anymore.

So tell your co-workers it's not just you and to stop being some haters :)

I have a Verizon phone and it does the same thing, especially when I am working on my laptop. When I have my phone away from my PC at a certain distance it doesn't buzz anymore.

So tell your co-workers it's not just you and to stop being some haters :)

I have a Verizon phone and it does the same thing, especially when I am working on my laptop. When I have my phone away from my PC at a certain distance it doesn't buzz anymore.

So tell your co-workers it's not just you and to stop being some haters :)

One other person posted about an incredibly annoying buzzing noise that all Treo 600 users experience. I am on my fourth 600 and I am experiencing the "Buzz of Death," as it has been coined, again. I can't convince my company to upgrade to the 650, so I?m stuck. Internet research shows I'm not alone. Does anyone have a solution?

I have an LG-1150 ATT cell phone that is now part of Cingular now. I too get the buzz about 15 seconds before my cell phone rings and while it is ringing. I know this is annoying, but I am more concerned about what this static could be doing to me! I mean, I have the phone clipped to my belt all day, so what is it doing to my organs if any thing. Does any one know the answer?

This is not very practical, but I have a headphone amp for my 5.1 surround sound headphones (MEDUSA 5.1) And alot my firends have cingular phones, and at lan parties my headphones are always clicking and screeching because they refuse to turn off thier cells.

Becuase cell providers are allowed to generate those singals due to the fact that they liscence the right to due so from the government..

So the solution is to protect your components from noisy applainces such as GSM phones like what congular offers.

I went overboard, and fabricated a dual shell and grounded aluminium for the amplifier and power supply. Plus put EMI shielding mesh on the cable between the amp and the powersupply.

Now My buddies can put thier phones on top of the amps and I have no issues..

But as mentioned earlier, aluminium foil around your power components on your speakers and such will keep you safe from the all but the most obnoxious GSM offenders (jerks who find it funny that thier phones mess with amps and such)..

But that is easily solved by nabing thier phone and taking thier battery away from them until they behave..

Funny how many people this happens to but no one ever talks about it..?

I used to have Nextel service and recently switched to Cingular. I used to have the buzzing noise with My Motorla Nextel (i58sr) phone over speakers and land based phone lines. Very annoying during conference calls. I also had spotty coverage. I sucumbed to Cingulars claim of more bars and best coverage. Wrong move.... I ended up getting a Motorola RAZR V3. My service went from bad to unbelievably terrible ay home... I have to go upstairs to get a signal. We have so many dropped calls its ridiculous! In addition, the buzzing over speakers, tv and land phone lines is even worse.

I have to wonder, is it possibly Motorola phones that cause issues more than providers (Nextel and Cingular) I have researched this topic iuntil my head spins... Some people say it is the GSM network that causes probles... Yet my wifes Nokia 6360 has no issues and she has Cingular service as well. Here Nextel Motorola i85 caused the buzzing... I personally think Motorola is more of a culprit than any other parties...

I am off to find another provider that will not buzz my life and drop my calls.

I work for a Canadian GSM/GPRS Provider (cough.. ROGERS) and having been in an office with dozens of phones operational while I'm sitting there trying to make calls I'm here to tell EVERYONE in no uncertain terms:

THIS HAPPENS TO **ALL** GSM/GPRS EQUIPMENT and to a lesser extent, CDMA and TDMA.
*****ALL OF THEM*****.

There should be no one else posting saying "it happens to my phone too! " or "what about this model?!"

ALL OF THEM.

It has only gotten worse with time too; they very first analog phones transmitted at between 1 and 6 watts, with 6 watts being one of the "bag phones". Then, when people started to freak about EMI and exposure limits, they drastically reduced the transmitting power to between .5 and 1 watt (no more bag phones). It was because of this that most people switching from analog to TDMA/CDMA noticed worse reception, because the phones then had to be signifigantly closer to the towers, and hence.. the massive expansion of towers across north america to compensate (oh, and to fill in the huge coverage gaps to begin with). THEN, when they started showing that the EMI wasn't soooo bad, people calmed down a bit, and now the phones transmit from between .75 and 2 watts.

Any unshielded land-line phone, speaker, headset or in some cases monitors and TV's (there are Shielded versions of all of these being sold now) will experience this excruciatingly annoying interference.

The only thing you can hope to do is, like many others have tried, to shield these devices yourself, usually with a few sheets of tin foil (INSIDE the device LOOKS a lot nicer than one which is covered on the outside with foil). Anyone who has worked with a Treo 600 may understand this even better, as that particular phone was cursed with an unshielded wire INside the Treo, which caused interference with its OWN calls (the solution was, to bravely void the warranty and open up the phone and surround the offending wire with tin foil as well, or else, send the phone away and pay a tech 100 bucks to do the work, which is NOT considered under warranty... don't be fooled..if they simply replace the device, you have a brand new Treo600 with the same problem.)

--BOTTOM LINE----
So, to everyone out there in wireless land, you're either left buying a shielded device, or shielding it yourself. Period. And either way you should give a call to the FCC and complain until they hear enough about it to make the phone manufacturers fix the problem. We as Providers (Rogers, Cingular, Verizon, etc..) have ZERO to do with how the devices are made.
(Quote: >>: FCC RULE
"# This device may not cause harmful interference and
# This device must accept any interference received, including interference that may cause undesired operation.
THE public has a right and duty to report this type of problem to the FCC.)

Happy shielding, hope this takes the confused looks off your collective faces

I have the problem ..WE ALL have the problem. In the house the Car the office. I have the Razr and it does it Everywhere. Sort of like having a Porsche that Backfires ya know? NOW I KNow ALL OF THEM have the problem but the sales people don't tell you that. I recently left sprint for this? Now I can't listen to music in my car or see a movie in surround sound without that noise. BUT I CAN look like a predictive wonder when I say (upon hearing the buzz in the Frantic mode) "Hey I am about to get a Call" RINGGGGGGGG! No that they will care but I will send this url to Motorola. As for all the Self fixes I see here. I am not fixing ANYTHING. for the price of this phone THEY should fix it because kids DON'T Think for a SECOND that this issue was or is NOT known by the suits and engineers at motorola. THEY JUST DON'T CARE! You didn't find out about it until AFTER you paid and signed the contract. It is called Business. They got our $$$...end of story. I for 1 would have NOT paid for this if I knew in advance. please excuse the rant but I am fresh from my fight night party that I had last night I presented on a VERY pricey system in my home and I embarrassed all night by that freakin buzzing.( you should hear it via 7.1 digital surround at 1000watts)

i dont think it is just cell phones, i have a uniden dual handset. and it is doing the same things

Can someone post a link to a website or e-mail address where we can post our complaints with the FCC?

I have the same problem too and it has ruined more than one recording session when that buzzing sound erupts from the monitor speakers. We finally decided it must be the cell phones and they are now banned from the studio. I agree that we should all complain loudly and often to the FCC.

I am sorry but I think you are reading this the wrong way. Cell phones today are almost a given. And to me, a necessary fact of life. I wish it wasnt the case, but unfortunately it is. The problem is not about phones. Its about SHIELDING the equipment that gets affected, or buying shielded equipment... If tin foil works that is what I will be trying... Motorola wont pay anything to fix the problem Mr Nick on OCt 4th, because it is not THEIR problem. It is not in THEIR equipment, but in yours! Keep phones away from amps, and use bluetooth to get the sound to your ear and mouth- that is my 2 cents... Dont mean to offend anyone, just giving you my opinion... Nick from Athens-Greece

Yeah, I have a Mot. RZR and thinkig it was going to be a hit with all my friends, well let's just say that I'm not Mr. Popular when I get around speakers or the like. It really sucks that you cannot but some sort of filter (like those antenna boosters) that will filters the signals coming in and out of a phone. My Razor phone has managed to, #1.Ban me from from bringing it to band rehearsal and live performances (The Swear, Atl. GA), #2 fry a set of PC speakers I paid $$$ for, and #3, piss off everyone I work with.

Thanks Motorola, I can always count on your superior level of quality. OH! Did I mention the eardrum piercing ringing that's coming out of the earpiece???? Yeah, I have to use the spkrphone function now if I want to talk on my nice RZR phone, ridiculous!!!!

My Daughter is picking up music through her stereo speakers. Music that she is not playing. Can the speaker wires be acting as an anntea or picking up satellite. Any help would be appreciated. An exorcism is out of the question she is in WVA. Thanks.

My Daughter is picking up music through her computer speakers. Music that she is not playing. Can the speaker wires be acting as an anntea or picking up satellite. Any help would be appreciated. An exorcism is out of the question she is in WVA. Thanks.

I used to work at Hertz Worldwide Reservations in the "res" center. We had strict rules about cellphone use near the computer cubicals. It was even a "terminate-able" offense. We started getting a lot of high school graduates with newer gsm phones. Not only did my monitor mess up, but I could not complete a conversation with a customer because that morse code sound interrupted my headset. Hertz finally put out an ultimatum that if someone was caught 3 times causing interference, they would be terminated with cause.

I am in the midst of working with a lawyer to get a patend pending that will solve all of your needs. I am starting a list. Please email if interested the product will only be $1 - $3 and will eliminate 75% - 99% of the noise.

Have the Treo 650 here, with Goodlink... Due to the goodlink, the phone syncs up all the time with the server, and so therefore every 1-2 minutes I have to listen to the buzzing sound... It interferes with my alarm clock at home, waking me up at night, interferes with the speakers on my pc at work and home, and even interferes with my speakerphone at my desk... VERY annoying. I had a Blackberry 7100t from TMobile and it rarely did it....... Only if you put the phone right up to the speaker while on a call, but I understand the blackberry from cingular does it all the time just like the treo.

I have a Motorola V557 now, and both this one and my previous Motorola not only make noise, but seem to have blown out the sound in my (admittedly cheap) speakers. The V557 is so much more powerful that I even when the phone is in the kitchen (directly through 1 wall) I can still someitmes hear the static pings. The woman at Cingular basically treated me like I was talking about an attack of alien beings and dismissed my concern without further ado. I'm so glad to hear I'm not the only one!
However this interference doesn't happen at all at work, and all I have there are inexpensive Dell speakers which can't possibly be shielded as well as some of those of previous postings??. I have NO knowledge of electronics, so this may or may not make any sense, but: 1) my home is near a large retail area with a radio tower, and 2) my work is at a university in a very solid 1940's building. Does anyone think those factors make a difference?

Same 'problem' here with my Cingular Nokia phone. A progressively louder buzz for about 5 seconds before most calls, buzz stops during call, then at totally random times I get a minor buzz for about 2 seconds. Sometimes theres no buzz before calls. More amusing than annoying for me.

I have the new Nokia wit Cingular and everywhere I go now, everyones PC speakers are making that noise, bzz bzz bzz, bzz bzz bzz, bzz bzz bzz, and now all of a sudden, I can read minds and see through womens clothes. I kind of like it! I never realized how many hot women ran around without any panties on!!! Wait, gotta go, mother ship calling, bzz bzz bzz...

Does the sound disappear if you turn off the Phone function? I'm afraid to bring it with me to band rehearsal because it's *real* loud through a guitar amp...

Well thank you all, for solving my problem. I have a Samsung x495 and have been having the same experience. I just tried dialing a number on the phone to check this out, and voila there were my morse code sounds!

I have been going nuts trying to figure out what was causing this---even in the middle of the night when the computer was turned off!

The problem you are experiencing is due to 1) The way cell phones communicate, and 2) The way speakers are designed. You see, speakers rely on coils of wires, and the science of induction (as well as other studies) to produce sounds. When a current reaches the coil, a magnetic field is produced in its center and attracts the speaker magnet. An alternating current will cause it to bounce back and forth, giving the signal that is intended. Before a phone call is made, a sync operation is made between the cell phone and cell phone tower (which is why the phone doesn't ring immediately when it's called). This sync is a pattern of on and off states, sounds a lot like morse code, and is intended to be recieved by the cell phone antenna. When the cell phone receives this sync, it is recieving an electric component of an electromagnetic wave. Physics shows that there will be in turn a magnetic component that wraps around that electric component (hence, an EM wave). This wave reaches the cell phone as well as the speaker coil and thus causes the speaker to buzz before you hear your cell phone ring.

The company I contract for uses every major US cellular phone provider (~5200 phones, PDA's, etc.). Only Cingular phones (ALL models and device types) do this.

Add one more to the list.

I am fed up.

Where the hell are the MythBusters?

I had to switch to Cingular from Verizon because Verizon has very poor coverage in my own home neighborhood. I was using a Treo 650 when I left Verizon and I never had this speaker interferance problem when I was with them. Now I've sold my Verizon Treo & switched to Cingular because of their better coverage but I'm having major speaker interferance problems much like what is being discussed here. Cingular tech support can explain exactly why it is happening but they offer no solutions. They have 101 ways of diplomatically saying "live with it". In fact, 2 of the 3 people that I talked with said that they themselves have the problem all the time and its just one of those things . . .

This problem caused by GSM devices is very annoying. At work not an hour goes by when speakers start making the now annoying noise. While watching the Tonight Show two weeks ago, Jay Leno?s monologue was interrupted by the morse code noise coming out of the music bands speakers. Something needs to be done.

We have Cingular service and three Motorola GSM phones (V180, L6 triband - no 850MHz band, and a V3) we haven't noticed the speaker issues but we do get interference from all three phones with our Comcast HD-Digital Cable box / Sony rear projection TV. An older Nokia phone (no SIM card) on Cingular does not cause a problem. The interference causes the picture to change to a bunch of large squares. It only happens when one of the phones is making or recieving a call.

My Moto V551 does it too, At least now I know its not aliens trying to contact me.

yea my motorola v555 does it....very annoying...

I've got a good one. I'm using an hp 6315. I purchased this PDA about 2 weeks after they came out. My service provider was tmobile. After some time the wife and I decided that tmobile had one too many dropped calls so we switch to cingular. As soon as I switch to cingular, the PDA started causing interference on speakers. In my case I can tell you that it has something to do with the way cingular interacts with this PDA that causes the interference.

It's not a specific phone that causes the problem, but rather a specific frequency (850 MHz). The phone manufacturer can't do anything about the fact that carriers use this frequency to transmit data. If you don't like it, then shield your gear.