How do I update my iOS
it won't let me download apps because I need to update my iOS how do I do that
iPhone 5, iOS 10
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Hopefully the relevant Apple Support article is helpful.
Update your iPhone, iPad, or iPod touch - Apple Support
That said, I see that you have an iPhone 5. Unfortunately, the latest version of iOS that you can update to (at the time of writing) is iOS 10.3.4. If you require a more recent version of iOS, you'll need to purchase a new iPhone.
Cheers.