Hi all
I am using old samsung cell phone with T-mobile provider. Today I figure out LCD screen of my phone is not working anymore so I switch sim card to samsung black jack2. Unfortunately when I insert the sim card to this black jack 2 it show some network problem like I need to unlock the phone to use T-mobile sim card. Anyone has ideal to help me with this problem (any free website show how to unlock phone step by step?) Thanks.

Note: my samsung black jack 2 was using AT&T last year and I already terminated contract

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