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LTe
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Reposted from
catarino
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teisei
catarino
teisei
As I know its not the device that predicts calls but the GSM technology being used. Nowadays this device does not predict upcoming calls because of different wavelenghts being used for mobile phones. Switch your phone to 2G mode and predictor shall work again :p
Hmm... I think it even might predict calls still (or any data exchange with the cellular) but the way mobile conn works since 3G is that it starts with the lowest transmitting power and ramps up power when the link gets unstable. 2G worked by using the highest power possible and then stepping down (this approach was reworked with 3G and onwards because you are holding the phone to your ear and someone was like: you know what that might not be the best idea to start the link at full power)
Hence i believe you can hear (or at least measure) the electromagnetic interference with 3G and onwards but the transmitting power might not be high enough to produce an ear-detectable signal
But it might as well be dependend on carrier frequency (that is wavelength) as well, although I'm not so sure about that, since GSM also operates in the MHz-ish frequency domain
I think what you heard there was most likely the turning off and on of the antenna