I'd like to know if I need to keep a iOS7 device laying around for a test case or if ultimately every iOS 7 device will be upgraded to iOS 8.

I have several iOS 6 devices that cannot be upgraded to iOS 7.

  • Although, just because a device is capable of running an iOS version doesn't necessarily mean it should (or will) be upgraded. iOS 8 is more processor hungry, so the older devices that support it (eg. iPad 3) are likely to run slower. – MrWhite May 15 '15 at 20:11

As far as I know, the iPhone 4 is the only device capable of running iOS 7 that can't be updated to iOS 8.

Ref: Wikipedia - http://en.wikipedia.org/wiki/History_of_iOS#iOS_8 - & others

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