When I read about mobile call tracing, the hackers/security experts track and record mobile phone calls somehow.
Is it possible for us to identify that our call is tracked by someone or heard by someone?
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In digital communication, for the most part, information is not modified in any way when transmitted over a medium (presuming the use of appropriate noise reduction and error correction schemes). This makes impossible to infer, just by looking at the received data alone, whether the communication was hacked. The only realistic way improve to the security of your connection is by having an elaborate encryption-decryption mechanism on both ends of the communication channel.
To my knowledge there's no such mechanism in place for phone calls. It would be really interesting if companies like AT&T would start offering encrypted channels to VIP users, which would require both the caller and the receiver to have an encryption password for making important calls. If correctly implemented, at least in theory, even the service provider shouldn't be able to tap into the conversations.
From what I've read about this kind of stuff, I think it's probably a good bet to just assume that you're already being tracked, and that every conversation is being recorded (at the very minimum by one governmental agency).
Check out the AT&T + NSA warrantless surveillance controversy.