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This has to do with the different technologies used by AT&T and Verizon (GSM vs CDMA). GSM uses time-division multiplexing, so your cell phone emits short bursts of energy when transmitting, which is detected by nearby audio devices.
This has to do with the different technologies used by AT&T and Verizon (GSM vs CDMA). GSM uses time-division multiplexing, so your cell phone emits short bursts of energy when transmitting, which is detected by nearby audio devices.