FOUND A FIX!! Hi Just went through this same problem, I recently switched back to t-mobile from verizon for living abroad. After I set up my sim card and ported my phone number from verizon I could not make calls or send and receive text, even when the wifi calling switch was turned on. I even reset my network settings and factory reset my phone and still did not work. I realized it was not working because I set up wifi calling in a place that had no cellular coverage. The way I was able to fix it was to find a place where I was able to get cellular service LTE, then I reset my network settings, then I turned on wifi calling again while in a place that had coverage, it worked! Once I returned to a place that didn't have coverage I could then call, send and receive text through wifi.
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