Will my iPhone 4 lock if I update it to iOS 7?

I bought an iPhone 4 back in January and took it to a store to get it unlocked to run on t mobile, now I wanna update my phone to iOS 7 but don't want to risk locking it.

If the phone was legally unlocked and all paid for, ios7 will be fine.

If your phone is factory unlocked then you will update it any ios version & your phone will be okey. If it is not factory unlocked then your phone will be locked. So you need to know that your phone is factory unlocked or not before updating.

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