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I attempted to upgrade to ISO 9 and now phone is locked on slide to upgrade screen. Can I take out the SIM card on my iPhone 4s and put it into my old iPhone 4 and will it work?

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  • If my answer helped you, please click the checkmark to the left of my answer below. – RedEagle2000 Sep 23 '15 at 2:36
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Yes, so long as the iPhone 4 is on the same carrier as the 4S, it will work.

To fix the "Slide To Upgrade" bug, see Apple's support instructions.

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