Im experiencing the same problems with my unlocked S8 that I purchased from Samsung directly. Im unable to send Text Messages. Im able to receive texts and able to make/receive calls. I've tried with Puppy Wireless and Redpocket Verizon MVNO. I have called Samsung CSRs many times and sent it to them twice for 'repairs'. No resolution. Very frustrating. Not sure what I should do next. BTW it worked once with Redpocket but then stopped working.
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