Why won't my iPhone 6s update?
My I phone 6s not updates why?
[Re-Titled by Moderator]
iPhone 6s, iOS 13
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Are you sure you have a 6S and not a 6? What version are you currently on?
Go to Settings > General > About and see which phone you have.
• If you have an iPhone 5S or 6/6plus, the highest you can update to is 12.5.5
• If you have an iPhone 6S through 13, you can update to 15.5
Go to Settings > General > Software Update.
Update your iPhone, iPad, or iPod touch using WiFi -
Update your iPhone, iPad, or iPod touch - Apple Support
Update using your computer -
Update iOS on iPhone - Apple Support
