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this sort of problem occurs when u set the sim default or primary sim in settings the default code for 6030 nokia is 12345 but if u have changed it then write me ur IMEI no i will give u a master cheat code
The master code is a 10 digit number that will always be accepted as if it were your actual security code.
You can use the master code to change your security code back to what ever you like. When your Nokia handset asks you for the security code simply enter the master 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