A handy guide from Nokia on their secret codes for the following handsets.

5320, 5700, 5800, 6110 Navigator, 6120, 6124 Classic, 6210 Navigator, 6220 classic, 6650, 6680, E-Series, E51, E61i, E63, E65, E66, E70, E71, E72, E75, E90, N70, N73, N76, N77, N78, N79, N80, N81, N82, N85, N91, N92, N93, N93i, N95, N95 8GB, N96, N97

*#06# displays the IMEI - the serial number - of your phone.
*#0000# displays the firmware and its date.
*#92702689# (*#war_anty) displays the “warranty-menu” of your phone.
*#2820# (*#bta_#) displays the bluetooth-address of your device.
*#62209526# (*#mac_wlan#) displays the MAC-address of your phone it works just for the Wifi phones.

Holding # for three seconds on the home screen you change the active profile to silent or back.
By pressing 0 (zero) for three seconds on the home-screen you easily can open the web browser.
By pressing the Menu/Home key for three seconds you open the task manager, which shows all opened applications.

Nokia reset codes:

*#7780# (*#rst_#) does a soft-reset to your phone.
*#7370# (*#res_#) does a hard-reset to your phone.

Note: When the phone Reset to the factory settings, all data on it will be deleted.

Stumble it!