there are only 5 possibilities of entering the correct security code. if you enter 5 wrong codes, the phone stops accepting every codes, even the right one (but keeps asking it)
on old nokias (3110, 8110 and older) it was possible to generate (with only the imei)a 10 digit mastercode to unlock the security code. (never tested it, but wintesla gives that mastercode, for example in 8110, on "User settings" menu)
however, on new nokias, you need to reset the UI settings, using wintesla or PcLocals. it will turn off the code and set it to 12345 |