I need to update my iPhone iOS now
I need to update my iPhone iOS in other to be able to download more apps
iPhone 8 Plus, iOS 15
Question marked as
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.