HT201270 I have an iphone 4 unlooked by AT&T with a TMobile sim card. Does anyone know if downloading this update will screw-up my phone?

I have an iphone 4 unlooked by AT&T with a TMobile sim card. Does anyone know if downloading this update will screw-up my phone?

In regards to the iPhone being officially unlocked by ATT thru Apple?
No.
A problem arises when installing an iOS update on an iPhone that was hacked to be unlocked.

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