How will I upgrade my iPhone 6 today
I can’t upgrade my iPhone
iPhone 6, iOS 12
Question marked as
For an iPhone 6, you can update to iOS 12.5.7, no further. To accomplish that, please 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.