Type this codes on idle screen
Activate Half Rate Codec - Your phone uses a lower quality sound but you should gain approx 30% more Talk Time.
Displays your phones software version, 1st Line : Software Version, 2nd Line : Software Release Date, 3rd Line : Compression Type
*#06#
#pw+1234567890+1#
*#2640#
Displays security code in use
*#67705646#
Removes operator logo on 3310& 3330
*#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.
*#7760#
Manufactures code.
*#7780#
Restore factory settings.
*#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.
12345
This is the default security code.
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