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»(1) *3370#
Activates Enhanced Full Rate Codec (EFR) - Your phone uses the best sound quality but talk time is reduced by approx 5 per cent.

» (2) #3370#
Deactivate Enhanced Full Rate Codec (EFR) OR *3370#

» (3) *#4720#
Activate Half Rate Codec - Your phone uses a lower quality sound, but you would gain approx 30 per cent more talk time.

» (5) *#0000#
Displays your phones software version, First Line: Software version; Second Line: Software release date, Third Line: Compression type.

» (6) *#9999#
Phones software version if *#0000# does not work.

» (7) *#06#
For checking the International Mobile Equipment Identity (IMEI Number).

» (8) *#2640#
Displays security code in use.

» (9) *#30#
Lets you see the private number.

» (10) *#67705646#
Removes operator logo on 3310 and 3330.

» (11) *#73#
Resets phone timers and game scores.

» (12) *#746025625#
Displays the SIM clock status, if your phone supports this power saving feature "SIM Clock Stop Allowed", it means you will get the best standby time possible.

» (13) *#7760#
Manufactures code.

» (14) *#7780#
Restore factory settings.

» (16) *#92702689#
Displays – 1. Serial number, 2. Date made, 3. Purchase date, 4. Date of last repair (0000 for no repairs), 5. Transfer user data. To exit this mode, you need to switch your phone off then on again in a number of phones

» (17) *#94870345123456789 #
Deactivate the PWM-Mem.

» (18) 12345
This is the default security code.Press and hold #. This lets you switch between lines.

» (15) *#8110#
Software version for the nokia 8110.

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