It won't let me update past iOS 7.1.2 it keeps saying current software is up to date and I know that there is another update but how do I do it exactly?

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    You certain it's a 4S? The iPhone 4 can only use up to iOS 7.1.2, the 4S up to current, iOS 9.2.1 at present. – Tetsujin Mar 14 '16 at 12:31

My iPhone 4s is running iOS 9.2.1, so yes, there is another update. If Software Update on the iPhone isn't working, maybe try updating it through iTunes?

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