This article sums up a method of using prepaid cellphones and some decryption ... They reflashed some cheap phones with custom firmware to gain access to all of the data coming over the network.
FLEXIBLE PREPAID SIM CARD OPTIONS ... ensuring compatibility with your 4G (minimum) GSM-unlocked, factory-unlocked or AT&T-compatible phone. Note: Your phone must be AT&T VoLTE compliant to ...
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