Unlock-Instruction for Samsung Rugby SGH-A837 from AT&T USA

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Video about unlocking Samsung Rugby SGH-A837 from AT&T USA, by entering the unlock code. After sequentially entering these codes, the phone was unlocked!
Unlock is carried out once, after unlock your device will accept any SIM-cards and will be updated without any problems to the latest versions. The phone after unlocking will not be blocked again.
To unlock Samsung Rugby SGH-A837, depending on the country or type of lock, please follow the links: