If i have a tmobile iphone 4s will it reject a att simcard if not unlocked?

If i have a tmobile iphone 4s will it reject a att simcard if not unlocked?

I highly doubt that it will do so.

Yup. That's exactly what it would do.

THe phone needs to be unlocked before you can use the phone on AT&T. If you need help with getting the phone factory unlocked, mail me for references.

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