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I have an ASUS zenphone 3 max (ZC520TL) that I recently upgraded to Android 8.1 from Android 7. Before the upgrade, everything worked fine for the last 2 years. After upgrade, everything works except the sim, it cycles from available to unavailable, ...

How do I turn off text messages from Publicmobile? I keep getting "Congrats! Rewards have been ....." , and "Thanks for your payment"Can I opt to not receive these?