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[Q] T-999 Won’t Dial or Receive Calls, Shows 4 Bars

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Default [Q] T-999 Won’t Dial or Receive Calls, Shows 4 Bars

Samsung Galaxy S3 (T-999) stock, not making or receiving calls. Has been getting worse over the last 6-8 weeks. Now phone is almost unusable. Shows 4 bars of signal.

Phone says dialing, but never connects, no ringing sound. Sometimes after power cycling can make two or three calls. Often does not get data connection, though even when shows 4g cannot access data services. When others call, they go to vox mail. No ring or notification on phone. No error message.

Have tried several trouble shooting steps: Have tried different network modes. Have tired manually selecting T-Mobile. Have booted into safe mode. Have cleared the cache. Have done factory reset. Have tried different know good T-Mobile SIM card, and finally I replaced the SIM & SD Card Reader Module.

Nothing has had any effect, can anyone suggest a next step?
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Flash stock firmware and factory reset. If its still happening after that theres a good chance its hardware or network issues.
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