If that is the case then why does every single GSM phone that I have ever come across make exactly the same chirping sounds when placed next to anything with an unshielded amplifier when it checks in or receives a text message ?
It's probably just the phone's internals doing it -- eg. tiny spikes from switching the Tx power on/off 200+ times/second. Not the actual 850/900/1800/1900Mhz RF signal.
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