Why (and what) is my iPhone transmitting while switched off? My (Australian bought, legitimately carrier-unlocked, T-Mobile-SIM'd) iPhone 3GS is switched off (hold down top button, swipe red switch on screen) but connected to wall power and sitting on top of a poorly shielded computer speaker. Almost exactly at 5:00am it uttered the characteristic "dit dit de-dit dit de-dit dit de-dit" of a GSM phone chatting to a cell tower. I switched it off ffs, the GSM radio shouldn't be active! What is it sending to the tower and why? [more inside]
posted by m1ndsurfer on Dec 25, 2009 - 12 answers

It's the buzz buzz buzz in the drum of the ear, or, making my amplifier a tinfoil hat to stop GSM noises from my phone. [more inside]
posted by Halle on Sep 23, 2009 - 8 answers

What is the best flat calling rate pan-European GSM SIM card for temporary use? Two people with iPhone 2G (iPhone1,1) quad band unlocked phones will be in Europe for one month. We want voice and SMS only, not GPRS data, and the ability to add credit to either phone by scratch cards... [more inside]
posted by thewalrus on Aug 11, 2009 - 4 answers

Why is my iPhone (3g) suddenly making a new and totally different kind of buzzing into my cheap speakers in additional to the good old GSM buzz I'm used to? Here is the sound. (608k .wav) [more inside]
posted by Space Coyote on Jan 8, 2009 - 2 answers

Electricity and Magnetism geeks - help me! I would like to stop the GSM interference from my iPhone to my speakers with ferrite chokes. I imagine a bit of information would help me get the best ones... [more inside]
posted by twiggy on Aug 11, 2008 - 12 answers

Got a lead on some decent-sounding, not-outrageously-pricey speakers that are shielded from GSM buzz? [more inside]
posted by evariste on Apr 10, 2008 - 10 answers

How can I make the damn GSM clicking from my iphone stop attacking my baby monitor? [more inside]
posted by brent_h on Jan 5, 2008 - 15 answers