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Can someone listen GSM calls with RTL-SDR dongle if A5/1 cryptography is successfully cracked?

Can an attacker listen GSM calls in clear audio form (real time) using RTL-SDR dongle if he/she has powerful-enough hardware to crack the A5/1 crypto scheme in countries where no more secure ...
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GSM mobile messages with the first octet 01000000

In GSM networks, it is found that there are so many mobile phone messages (uplink) with the first octet 01000000. For example, the 28-octet message ...