First use of SIM in new phone in Europe

couzens

    I live in Ireland but maintain a T-Mobile US number carried over from when I lived there. I recently bought a new phone (Samsung J5) but the T-Mobile SIM won't let me make or receive calls. It works fine in my iPhone 8 (with my Irish SIM) and the iPhone 6 that I was previously using for the SIM. If I call out from the phone I get routed to T-Mobile ("thank you for calling T-Mobile etc"), if I call in I get a "cannot connect your call" message. It was bought with a region lock but I followed the instructions to have it removed and I don't get the region lock screen come up when I start the phone with the T-Mobile SIM in it. Does anyone have any ideas?

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