The GSM encryption is really designed to control subscribers and not really
Meaning that the encryption is over the air only. Once it gets to the base
station and gets turned into TCP/IP traffic then all bets are off. There is
also 50 years worth of technology laying around being used in telephone
systems with numerous built-in back doors created for monitoring calls for
law enforcement, tracking users, and all sorts of other things.
So if your paranoid and want to be safe the only thing you can do is do
encrypted VoIP AND use a phone with open firmware. VPN stuff makes it
relatively simple once you get the software and the data line to your
Of course the GSM encryption stuff is pathetic in how poor it is and how
old fashioned the thinking of the telephone companies are.