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Here the secret codes of cell phones Nokia N95 modes Nseries

*#06#
To check IMEI number (International Mobile Equipment Identity)

*#0000#
Firmware version and date, Phone Model and Operator Variant

*#92702689#
Life timer (W A R 0 A N T Y) - The amount of time your phone has spent sending and receiving calls.

*#62209526#
Wireless MAC Address (M A C _ W L A N)

*#2820#
Bluetooth MAC address (B T A 0?)

*#7370#
Format phone (R E S 0 ?)

*#7780#
Factory Reset (R S T 0 ?)

Note:

Format phone :
Restores phone to as if it was out of the box. Retains firmware version and operator Variant changes but wipes all applications you have installed. Does not format the memory card so any apps on there may reinstall once powered back up again.