I have the Nokia 3510i phone. Last night I was just changing the SIM card of my phone and the new SIM was not getting recognized. So I tried to change to my previous SIM again. As I inserted that back to the phone and switched that on then it shows me the message to enter the Restriction code. I don’t know that what is this restriction code and what should I enter to make that phone unlock. If someone is having any idea about this then please let me know that. I will be thankful to each reply.
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