What do I do if I'm really behind on Apple iPhone updates?

So I got the 6s almost two years and only updated it once since then. When the really big update came out I forgot to update it so I'm very behind on the updates. I'm worried that my phone will crash if I update it now but I don't want to buy the iPhone 7. Has anyone updated their iPhone after a long time with no updates?

Chill. Upgrading is an OPTION, not a requirement. Some people upgrade immediately, some don't upgrade at all. I've taken old, discarded phones and upgraded them to the latest OS version, without problems.

You don't have to upgrade step by step. Whenever you're ready, just let the phone do its over-the-air upgrade, on its own, and relax. Keep in mind, however, that DOWNGRADING is not as easy.

Read up on the pros and cons of each iOS version, and decide which, if any, would be beneficial to YOU.

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