Secret codes:

• *#06# - IMEI number (International Mobile Equipment Identity).
• *#0000# - Firmware version.
• *#92702689# - Life timer (W A R 0 A N T Y), The time your phone has spent in sending and receiving calls.
• *#62209526# - Wireless MAC Address.
• *#2820# - Bluetooth MAC address.
• *#7370# - Format phone.
• *#7780# - Factory Reset. Note:Retains firmware version and operator Variant changes but it wipes all applications installed. It does not format the memory card. Any applications therefore required may reinstall.
• Both need security code. The Security code, which, by default, is 12345.
  

Hard reset:
Turn the Power off of the phone Press and hold Green, * and 3 and keep them held whilst powering on and for a few seconds after. Factory Reset resets all settings to defaults but keeps any applications you have installed and photos etc.