MIT Tech News - 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 networks.
More on this article click here > Software Update to $20 Phones Could Topple 2G Cell Networks | MIT Technology Review
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