Help me for updating my iOS version in iphone 6 plzzz help me

iPhone 6 can only update to iOS 12.5.7. No more updates after that.

You need an iPhone 7 to update to iOS 15. To update to iOS 16, you need an iPhone 8 or higher model.

Hello,

Make sure you have enough storage,

I recommend reading this-

Update your iPhone or iPad - Apple Support

TrystynM wrote:

Make sure you have enough storage,

Freeing up storage space will not enable the OP to update their iPhone 6 beyond iOS 12.5.7.