iOS 7.1 on the iPhone 4: As good as it's going to get

You can't patch out a slow processor, but Apple does its best.

iOS 7 review Expert Reviews

iOS 7 review Expert Reviews

Final Words - Apple iPhone 4S: Thoroughly Reviewed

Can you install iOS 8 on iPhone 4? - 8 steps

Another big security flaw found in iOS 7.1

A few of the phones in my collection, from left to right: iPhone 4

Update iPhone 4 to iOS 8 or 9 - Is this Possible?

iOS 7 review

fluff] Used powdersn0w to downgrade my iPhone 4S from iOS 7.1.1 to

iPhone 4 - Wikipedia

iOS 7 review Expert Reviews