Sony Ericsson T18

*#06#
for checking the IMEI (International Mobile Equipment Identity) Information you get from the IMEI:
XXXXXX XX XXXXXX X

TAC FAC SNR SP
TAC = Type approval code
FAC = Final assembly code
SNR = Serial number
SP = Spare
To access SIM-Locking menu of your phone, press: < * [CLR] <
Be careful or you may lock your phone.

Message Report
When you writing a message, place at the start of it the code *0# and continue with your message. It's job is like nokias report. It gives you information about the sended message.