I have the same problem after Pie update, no data unless on Wi-Fi. Called Straight talk and they said everything was ok on their end. Tried changing many APN's but no luck. Took my SIM card out and put in the wife's S7 and it worked fine so the problem is definitely in my phone. Not sure where to turn to. I hear Samsung is not much help also. Might have to go back to rooting.
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