Solved UICC Issue In late September, My phone updated. Then this annoying popup started. T-Mobile finally admitted their system upgrade for 5G was the issue and I should get a 5G phone. Not! Their upgrade is incompatible with Samsung''s SIM authentication. This is collusion for sales. Then on Election Day, T-Mobile starts another upgrade. I couldn't send texts for 36 hours on top of popup. They told me to be patient. Sorry. 2 problems too many. Solution: New SIM New Carrier AT&T Same Phone S8Plus No Problem
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