iosiphone

Upgrade my iilbroken iPhone 4 iOS 4.2.1 to iOS 7.1.2

I’m new to this but I’ve had my cell phone years and years they told me I had to stay under Apple’s radar so I never tried to update it. Now I can hardly use one of my applications, for example I can no longer deal with FaceTime. Can someone provide step by step instructions on how to update my phone?

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