This current piece of contraption can only receive, tap, and intercept unencrypted GSM signals.
For encrypted GSM signals, that process is going to be far more than just Arduous.
Hack a day
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source: www.techworm.net
Building your own GSM station has become the simplest task in the world
The process that governments use in order to make a GSM station can easily be replicated by you, as demonstrated over here
