How do I identity the manufacturer/tower of my SIM card?

I have 4 iPhones here. We're going to Spain/Portugal/cruise and Consumer Celluar told me that I need a T-Mobile SIM card for roaming there. (Yes I'm also using Wi-Fi calling, and Skype for other things.) I think I switched out for an ATT, because of issues. So - among the four of them - how do I tell which are ATT and which are T-Mobile?

The provider name should be on the card.

If it isn't, pop it I to an unlocked phone and turn it on. The carrier name will appear.

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