I'm interested in finding out what kind of cipher is used on my Android phone. For example A5/1, A5/3 or is the GSM connection unencrypted. I was thinking about sending AT commands to the GSM modem (/dev/smd0), however I didn't find any command that would tell me this. Is this possible somehow?

migrated from security.stackexchange.com Feb 3 '15 at 9:10

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Try the service menu if your phone supports it: dial *#*#7378423#*#* (*#*#service#*#*).

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