Google on why you should disable 2G on your Android phone
SMS Blasters — which are also known as Stingrays, False Base Stations (FBS), and cell-site simulators — can be used by nefarious parties to “lure mobile devices to connect to them” and send fake text messages. One way to combat them is by disabling the insecure 2G connection on your Android device.
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http://dlvr.it/TBNt6C
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http://dlvr.it/TBNt6C