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first u try the 1to10 nbr in security code.if it does'nt work then try 000000....it is also wont work then try the first sim phone nbr.If it does'nt work.Then only one way update ur software or flashed it.
If the Nokia 7210 says security code error means You can use the Master reset code to reset the Phone,get the Free master reset code from here
Unlock-free and reset the Phone from the password lock,Then you can format it.....