Can you update the iOS 7 thing on an iPhone 4?

Can you update the iOS 7 thing on an iPhone 4?

Yes, you can

iOS update is available on iPhone 4, iPhone 4S, iPhone 5, iPhone 5S, iPhone 5C, iPod Touch (5th generation), iPad 2, iPad (third generation), iPad (fourth generation), iPad Air, iPad Mini (first generation) and iPad Mini (second generation)
http://en.wikipedia.org/...OS_devices

Yes, you can. The only thing I wanna tell you is your iPhone 4 will slow down a lot.

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