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SM-G906S T-mobile network issues

I have the G906S. It was working on T-Mobile perfectly for nearly a year since I got it. Then all of a sudden it would not connect to the network. Somehow I got it to connect again, but then the same thing happened.

The phone reads the sim, but I get out of service and network unknown when I check the status. I do see my phone number so I know the sim is being read. I had MetroPCS do activation with a MetroPCS sim, and they were able to activate it, but I still had the same issue. I checked the IMEI, and the IMEI is clean.

The phone will connect to AT&T, but not T-Mobile. I have upgraded, downgraded, factory reset, changed bands, and changed modems. Nothing seems to work.
Really not sure where to look for this issue as I have never had it before. I would really appreciate some help or info on this issue.
 
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