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What code do I need for the 2nd hand Samsung Galaxy S II I bought?

I just purchased a 2nd hand samsung galaxy s2 but when i turn it on its looking for a code of some sort and i don't have a pin code and don't have any other codes for it. what do i do?

I think it is carrier lock.If you want to unlock carrier lock , first get the unlock code and unlock your carrier lock.You can buy the unlock code from online providers like

What does it say? It could be security code or could be carrier unlock code. If it's security code, you can get it from the carrier your phone was originally purchased from. I'm not sure though if they will help if you're not their subscriber. If it's carrier unlock code, you need to get code from phone unlocking websites.

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