Verizon iphone 4s unlocked to tmobile update to ios7?

I have an iphone that is from verizon and i got it unlocked to work for tmobile. I want to update it to latest ios 7. Can i update it without the unlock going away? If i can will my phone keep working after?

It will probably be fine it shouldn't mess with that cause all your doing it upgrading to iOS 7 so it shouldn't mess with that.

If the phone is software-unlocked, the unlock will be removed when updating the iOS. If the phone is factory unlocked, the unlock will stay even after updating the iOS. If the phone is not factory unlocked yet, get it done and then update the iOS. If you need help with factory unlocking, mail me for references.

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