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When you place a new or a existing SIM card from another phone provider into your mobile phone and it asks for a Security code then :- This phone is locked to the original mobile phone provider. You need to contact this mobile provider to ask for the unlock code (security code) for this phone. You need to provide proof of ownership etc and the phone's unique IMEI number which is located inside the phone under the battery. They use this number to generate the unlock code for your phone. They should provide you with instructions on how to enter this code into the phone. Once you unlock the phone, then you can insert a new SIM card in this phone.
master code for imei 355397009002339 is 3537356212. After unlocking it goto security option.Now it will ask you for the password so enter 3537356212.And after entering this no it will ask you for a new password..that's it enter new password for 2 times and you are done.
Its not asking for phone password ,as you told that you have access to phone with old sim but not with new one,so its definitely asking for PUK code which you can get from calling the customer care of new sim card.......
If still it is asking for security password then let me know and reply with your IMEI no of your mobile by inserting the old sim card and then type *#06# at the screen,you will come to know your IMEI no.
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