How do I update my iPhone iOS?

Assuming you have a compatible device, see: Update your iPhone, iPad, or iPod touch - Apple Support

And: If your iPhone, iPad, or iPod touch won't update - Apple Support

If the above Apple articles do not help, please post back with relevant information. 

Jennifer ~ What model of iPhone is it?...

Settings > General > About > Model Name

Learn how to update your iPhone to the latest version of iOS here:

Update your iPhone, iPad, or iPod touch

...found by searching Apple's Knowledge Base.

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change iOS