If you must use a GSM phone, power it off completely (not just standby) when not in use. Remove the battery if possible. Use it only once and discard the SIM.
These are the "good guys." Composed of cryptographers and university researchers (such as the famous "Karsten Nohl" of Security Research Labs), these teams crack GSM to prove it is insecure. Their goal is to pressure telecommunications companies and standards bodies into upgrading infrastructure. They release "proof of concept" tools at conferences like Black Hat or CCC (Chaos Communication Congress) to demonstrate that the Emperor has no clothes. gsm crack team
The will remain a critical asset—and a civil liberties flashpoint—for the foreseeable future. If you must use a GSM phone, power