How can I update iOS on my iPhone 13?

hi,

to update your iphone you just have to go to: Settings > General > Software Update.

follow link below to find more about how to update your iphone!

Update your iPhone or iPad - Apple Support

Know how to...

• Update Over-the-Air (OTA) —> Update your iPhone or iPad - Apple Support (IN)
• Update using iTunes/Finder —> Update your iPhone, iPad, or iPod touch - Apple Support (IN)