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I want to unlock sumsung j 750 and sim card for use in international sim

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How to fix my phone samsung monte gt-s5620 cant accept sim ??

Take to T-Mobile! They will do it for you. Don't tor ture yourself. Here's their how-to but take to store and have them do it for you.
May need to be reformatted and you don't have a sim formatter.

Kind Regards,

Scott How to insert your SIM card

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What's a PUK code

A PUK (PIN Unlock Key) code is required to unlock SIM cards that have become locked following three successive incorrect PIN entries. If your SIM card becomes locked, you will need to get a PUK code to unlock your SIM card.If you enter the wrong PUK code 10 times in arow, your SIM card will be invalidated, and you will need to purchase a new SIM Card . The phone will display the following error: "PUK blocked call operator."

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when i turn on my Samsung SGH-A797 it tells me sim password

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