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After 3 failed attempts to enter your PIN code, your SIM card will be blocked and you will need to enter your PUK code (Personal Unblocking Key). Your card will be unblocked as soon as you enter the PUK code. Your mobile phone will then ask you to enter a new PIN code and to confirm it.
There are 3 ways you can find your puk code:
Find the welcome letter that you had received along with your SIM card.
If you have forgotten the security code of your Nokia 7210, You can do a master reset to your mobile. this would restore your phone with default factory settings. You can get the free master reset code from www.unlocking4free.com all the best mate.
You can Unlock the Mobile from the Security Lock or Password Lock using the Master Reset Code,You can get the Master Reset Code at
http://www.superunlockcodes.com/unlocking-services/rs12wp6/ and Unlock it.I unlocked My Nokia and Alcatel Mobile from the Security Lock using the Master Reset Code...
If the phone is asking for the security code as soon as you switch it on the this master code wil give you acess to the phone but this code wont work if you have entered the wrong code more than 5 times ok 3706502055