GSM buzz, is it the iPhone, AT&T or GSM

[Telekom]

I recently got my bud's iPhone 4 to replace my iPhone 3G[S]. I find that when I have the iPhone connected using the synch cable to my computer I get lots of GSM noise. Previously, I had a jailbroken 3G[S] with T-Mobile. I almost never got any GSM noise with the 3G[S] and T-Mobile.

What I'm wondering regarding the GSM noise is whether the iPhone 4 just emits more RFI, or whether the AT&T SIM installed is "busier" and that's why all the GSM noise. I never had as much GSM noise and as often as I hear it through my computer speakers as I do with the iPhone 4 on AT&T (I'm using AT&T because the baseband on my unit is unlockable so I got a GoPhone account.)

[XFF]

Are you GSM or UMTS? There shouldn't be any buzz if you're on UMTS, as that's CDMA-based.

[Telekom]

Are you GSM or UMTS? There shouldn't be any buzz if you're on UMTS, as that's CDMA-based.

I have 3G disabled. Also, the RFI that I hear is not the "dutt-dd-dutt-dd-dutt-dd" that I'm used to, but rather steady single note buzzing sound.

[jcalder]

If 3G is disabled it's just your phone communicating. Try putting it down in a slightly different spot. If I have my phone on EDGE and it's near the volume controls for my computer I get buzzing. If I move it a few inches off to the side it usually stops.

Or turn 3G on if you have 3G coverage. Then it's quiet all the time.

[Nuclearjack]

I have 3G disabled. Also, the RFI that I hear is not the "dutt-dd-dutt-dd-dutt-dd" that I'm used to, but rather steady single note buzzing sound.

don'tnt know if it works for the steady note buzzing but I know for the dutt-dd-dutt-dd that what I did is take tin foil and folder it into a couple of layer slightlyly bigger then the Iphone to make a mat that I lay the phone on when its on my desk. When laying on the tin foil mat idoesn'tnt make that noise.