If I have a T-Mobile SIM card from my old iPhone. Do I buy a factory unlocked iPhone or a T-Mobile one

Please help

It doesn't really matter. Either one will work. The main advantage the unlocked one has is that it will support other carriers right out of the box while the T-Mobile won't until you unlock it. Either one will work exactly the same way.

I personally would go for the unlocked one since I don't have to worry about unlocking it later on.

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