I can't update my iPhone 6s to iOS 15.7.3
Update your phone
[Re-Titled by Moderator]
iPhone 6s, iOS 13
Update your phone
[Re-Titled by Moderator]
iPhone 6s, iOS 13
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.
That is the highest a 6s can go, or do you mean you can't update TO 15.7.3 ?
I can't update my iPhone 6s to iOS 15.7.3