How can I know what type of encryption is used by my mobile phone? 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?
Try the service menu if your phone supports it: dial *#*#7378423#*#* (*#*#service#*#*).