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How to unlock a locked sim for a Samsung GM-G550T1 without the serial number

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#1 Aaronbw


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Posted 10 January 2017 - 03:06 PM

One of my kids curiously entered three random sim codes into the phone and it locked. Unfortunately I don't have the serial number; it is not located on the phone anywhere, not under the battery. And I no longer have access to the bar code. I even contacted the manufacturer without success. I have exhausted my level of expertise. Does anyone have the genius to help me figure this out?  

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