*#06# to find IMEI (International Mobile Equipment Identity)

*#7780# Restores Factory Settings... (Memory, language, counters not included)

*#3110# for checking the phone's software (SW) - called firmware revision information.

*#746025625# [*#sim0clock#] to check if the Sim-Clock can be Stopped (Sim-clock-stop is a kind of standby mode which will save battery time)

*#92702689# [*#war0anty#] Phone asks 'warranty code:'

6232 (OK) Displays the Month and Year of Manufacture

9268 (OK) Displays Serial Number

7332 (OK) Displays the date of the last repairment - if found

7832 (OK) Displays (if found) the date when the phone was purchased.

37832 (OK) Set the Purchasing Date MMYY (This date can be set only once!)

87267 (OK) Transfers ALL phone numbers, Logo's, and ring tones from other gsm phones

if you want more tricks , tips and secrets for your mobile or cellphone check out left menu there is a section  secrets and tips for  all mobiles click on the mobile name for which you want to know...