I am the original poster who had this issue and wanted to close out this thread with what I eventually learned once I got back home in the USA. I am hopeful that this helps others from experiencing the frustration I had with my T-Mobile International service. It appears that my issue was due to an enabled “International call block feature” that nobody told me about even though I had specifically called T-Mobile ahead of my planned International trip. My phone had International calls blocked and this is what prevented it from registering successfully on any European T-Mobile service network. This feature was likely enabled years ago while I was a Sprint customer and carried over to my T-Mobile migration. Why all 5 lines on my plan didn’t have this enabled, I have no idea. The solution is to contact T-Mobile using the 1-800 number, wait 30-60 minutes for someone to pick up the call, verify you are the owner of the account, and then request the feature be disabled. UNFORTUNATELY, whe
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