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Help Issue with my Galaxy Note I

Hello Everyone....especially to Admin... i had problem here with my Samsung Note 1. exectly after i update my phone..sudenly after reboot the phone prompted me to enter a Network sim codes...please help me....
 
This is very much a guess, but it sounds like your Note was originally supplied network locked, unlocked at some point and the ROM update has undone the unlocking.

Either that or it is a normal security (PIN) protected SIM, but I think that would produce a different message.
 
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