T-Mobile SIM card won't work with my replacement factory unlocked iPhone 5

On Saturday, my rear camera on my factory unlocked iPhone 5 stopped focusing. I took it in to my nearest Apple store and they replaced it. Problem is, now I can't get my T-Mobile SIM card to work with the replacement phone. The guys at the genius bar sent me to T-Mobile to see if a new SIM card would fix the problem, but I'm still getting an "Unsupported SIM" error when I try to activate the phone. Any insights?

Do you have information about the model no. of original purchase that is printed on the back cover ?
What is model no. of the replacement iPhone 5 ?
If T-mobile SIM worked on the original purchase and does not work on the replacement iPhone 5, they gave you a wrong model.

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