How do I update my iPhone

Hello jaida91,

The instructions in the following Support Articles will help. However, due note, iOS 15.6 is now currently available: About iOS 15 Updates - Apple Support

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Backup -> How to back up your iPhone, iPad, and iPod touch - Apple Support

Update -> Update your iPhone, iPad, or iPod touch

Current iOS version is iOS 15.6.

You can update directly from Settings->General->Software Update on your iPhone.

Or through a computer using iTunes or Finder. Link-> Update your iPhone, iPad, or iPod touch - Apple Support

Settings>General>Software Update.

The current version is 15.6, not 15.2.

See this link to troubleshoot an updating phone

Updating/upgrading your iPhone - Apple Community