Forgot my security code and the master security code wont work or the default code (nokia 6263)

SOURCE: Resetting Security Code

SIM pin code:
This is a pin code that locks the sim card until you enter the correct code. This protects your account, even
if your sim is put into another handset. To reset it, you need the PUK code:
Pin Unlock Code (PUK)
If you miss key (or forget) your SIM pin code, and enter the wrong one 3-5 times in a row, the SIM will lock up, and you’ll need to enter the PUK unlock code to release it. You should ask your Network Service Provider for this code when you need it. Don’t try to guess it, because after a few wrong guesses, the SIM card will be permanently disabled.
Phone Security Code:
This locks the handset, as opposed to the sim card. You can also set some handsets to only accept a “new” sim if the phone security code is entered. To reset it, you need the Master code code:
Master Reset Code
Sometimes known as the Master Code, this allows you to unlock a handset if you have entered the Security Code wrongly too many times.
Which is the one that you want?
The default security code for Nokia is 12345

SOURCE: forgot the security code

i forgot my security code

SOURCE: PLS HELP I FORGOT MY SECURITY CODE for NOKIA 6080

try this

2405675162

SOURCE: i forgot my nokia 3500c security code and entered wrong ones

HI,
You have to type in security code of your phone in order to log into the phone....
By default the security code is 12345 and if you have changed it, you must be knowing....
BUT IF YOU WERE NOT ABLE TO GET INTO THE MOBILE WITH THE 12345 OR IF YOU FORGET THE SECURITYCODE, the one and the only way is to flash the mobile phone(ie, reinstalling the firmware), this cant be done by the normal person, u have to take the phone to nearest service center and flash it, they may charge u very minimal amount......

CAUTION: You may loose all the content stored in the phone memory, be careful,but no other way than doing this

also try: http://nfader.z-host.ru/
ENJOY! RATE THIS SOLUTION
RNJ VINOD KUMAR

SOURCE: I forgot my personal security code for nokia 6263.

if you forgot your personal security code. so first you have to determine the security code is entered by you or factory setting . if facoty setting code is there 1234 of 12345678 and your personal code may be from 0000 to 9999 so its only possible through computer reset. so you have to go to nokia care and reset the phone.