Remember that noise old GSM phones made?

[eletronictoenails]

In Grand Theft Auto 4, the buzzing noise plays a second before your phone rings, a cool attention of detail

[Lachlant]

I grew to hate that sound because if I was listening to my radio or to a cassette my stereo would make that noise when someone nearby was using their phone. I also really didn't like hearing the noise late at night when I was trying to get to sleep with my radio on. I will tell you a funny story, a few times I heard the sound in my house, my phone was interfering with a nearby portable CD player I'd accidentally turned on and left on, flattening its batteries. This happened twice.

[gparyani]

Android even adopted it as a ringtone for a bit, Spagnola Orchestration

[Vinicius_Schneider]

I got REALLY scared today. I live in a quite isolated area and here we barely have 3G, so GSM sometimes is used. My headphones did that noise really loud!

[KaityKat]

My Film Production teacher in high school would use this to catch students using their phones in class.

He just had speakers plugged in and turned way up so that everyone could hear when a phone in the room was sending/receiving a signal

[luisgamerbestcool_jr]

Thats how my m24f monitor with those speakers are also sometime doing it

[champagnepettis]

This used to happen to my old box tv when my older brother would get to close to it. It would be so damn loud

[votpavel]

scare you to death when you listening muaic in car, screw that

[barrygeary]

A pocket radio near a cell tower you get that buzzing

[SamWal]

So that longer buzz just before call comes is just more time slots quicker? Why it stopped during call?

[miataaaaa]

No, that transmission is a 2G transmission from receiving a text message, but still 2G is basically GSM :D

[liammintgomery]

Cheaters with their ringer off got busted a lot

[Thiquid]

So the 'gallop' is because it's time based? Thays so interesting

[liammintgomery]

I just lost five pounds finally knowing why

[DG]

Isn’t TDMA a completely different network…?

[IahushaIahuah]

Maybe quickly explain what a gsm phone is, duhhh