1. Format Phone Memory (Symbian): to format phone memory of my N73 –> Backup your phone memory using Nokia PC Suite.
& then enter *#7370# ,will erase all contents of drive C and copy the ROM drive Z to C
2. IMEI Number: To check your Mobile phone’s serial number, key in the following digits on your phone: * # 0 6 # A 15 digit code will appear on the screen. This number is unique to your handset. Write it down and keep it somewhere safe.
3. Phone Stolen: Should your phone get stolen, you can phone your service provider and give them this code. They will then be able to block your handset so even if the thief changes the SIM card your phone will be totally useless.