[H]ard|OCP has stumbled upon some research even more wonderful than TV-B-Gone, a way to mod your GSM phone to be able to block the reception of phone calls and texts on cellphones using the same provider as you do. No longer will idiots who are unable to watch a movie in the theater without constantly calling their friends to let them know what they think of it impinge upon your experience. The hack essentially makes your phone respond to every query from the phone provider as being the target device for the call or text and thanks to a tweak to the software on the phones baseband processor the hacked phone responds to that query before the legitimate phone has a chance. This will not work on 3G or 4G phones as it is only effective against GSM but the researchers who developed the tweak estimate that 11 modified phones would be enough to completely take down the ability of Germany's third largest provider to provide service in a single cell.
"By making simple modifications to common Motorola phones, researchers in Berlin have shown they can block calls and text messages intended for nearby people connected to the same cellular network. The method works on the second-generation (2G) GSM networks that are the most common type of cell network worldwide. In the U.S., both AT&T and T-Mobile carry calls and text messages using GSM network."
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