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Other carrier phone compatibility with AT&T's service
I am considering switching my Metro by T-Mobile family plan and users to AT&T. It will include 4 Samsung A10e phones and one unlocked AT&T Samsung S9. I assume I'll have no issues with the S9 since it is an old AT&T phone, but will I have issues with the Metro phones? What will AT&T need to confirm compatibility? Will they need new SIM cards?