Find the software version on your iPhone, iPad, or iPod - Apple Support

What Version of iOS Does My iPhone or iPad Have?

Restore an iPhone, iPad, or iPod touch that needs a newer version of iOS or iPadOS - Apple Support

The History of iOS, from Version 1.0 to 17.0

Find your apps in App Library on iPhone - Apple Support

Update your iPhone or iPad - Apple Support

If your iPhone or iPad won't update - Apple Support

Apple - Support - Downloads

Apple - Support - Downloads

Restore your iPhone, iPad, or iPod to factory settings - Apple Support

Mark a device as lost in Find My on iPhone - Apple Support

Use Screen Time on your iPhone, iPad, or iPod touch - Apple Support