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My question is about the encryption between me and my mobile operator. My mobile operator uses A5/1. I use Samsung. Sometimes I see the symbol G on my phone which means GPRS. I don't know whether it means that it uses a secure connection or not (for voice calls).

Note: I know that government can go to the mobile operator and ask them to record my mobile calls but the question is about unauthorized spying.

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Some part of your question has been answered in this question security.stackexchange.com/questions/16020/… –  Ali Ahmad Dec 15 '13 at 17:39

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Yes if an attacker can create a fake basestation then they can effectively emulate the phone network and intercept calls which are made via that basestation. This is obviously a relatively local attack (e.g. you need to be close enough to the fake basestation for it to be the strongest signal available)

Some time ago the costs of doing this were pretty high, which precludes low-end attackers from doing it, however more recently there has been some research on using femtocells like the Vodafone suresignal to provide cheap interception of voice calls (more information on one project here

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Yes, but you have to be within 10 feet of the caller and you need to have an antenna and a bluetooth interpreter.

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Where.. did this come from? Are you making this up, do you have a source? –  ekaj Dec 15 '13 at 23:35

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