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in Phone by Neero4love (120 points)
My device is SM-A505F/DS, (4GB Ram/125GB Duo Sim) after a firmware upgrade I was unable to make calls not text with the phone it always coming up with 'not registered on the network I have tried so many instructions from YouTube none of that solves the problem. My region is Nigeria and I use the firmware for my region (ECT).

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