This was very helpful, enabled me to find my problem. The Tmobile ap had inadvertently turned on the scam blocker which blocked all of my calls EXCEPT spam calls. The Tmobile Tech was not able to identify the problem. Go to your account on Tmobile ap, more (bottom right), profile settings, Blocking, Scam block, turn it off. This seems to be a rather common problem, Tmobile should fix the ap.
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