Will my factory unlocked ATnT iphone 4 not work for tmobile after ios7?

I have a factory unlocked ATnT iphone 4. I currently use it for tmobile. I was wondering if I update it to the ios7, will my phone still function the same as before, or would it get rid of the unlock feature and no longer work with tmobile?

Yes, ios7 is jut an update it won't mess up anything with your tmobile account

If its is factory unlocked it will stay factory unlocked.

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