I don’t know what to do to allow my iOS 15 to install
I want to install iOS 15 on my phone
iPhone 6s Plus, iOS 13
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I want to install iOS 15 on my phone
iPhone 6s Plus, iOS 13
What iOS is currently on your iPhone? If you really have an iPhone 6s as indicated in your profile, it should support iOS 15.x. If you go to Settings>General>Software Update, what does the message say? If it shows you are currently on iOS 12.5.5 and that you are up to date, then you have an iPhone 6, not 6s and it does not have the ability to update. The hardware will not support the newer iOS.
If you do have an iPhone 6s, then see the instructions here to update your device. Update your iPhone, iPad, or iPod touch - Apple Support
What iOS is currently on your iPhone? If you really have an iPhone 6s as indicated in your profile, it should support iOS 15.x. If you go to Settings>General>Software Update, what does the message say? If it shows you are currently on iOS 12.5.5 and that you are up to date, then you have an iPhone 6, not 6s and it does not have the ability to update. The hardware will not support the newer iOS.
If you do have an iPhone 6s, then see the instructions here to update your device. Update your iPhone, iPad, or iPod touch - Apple Support
To update over the air from the phone all of these requirements must be met:
If you can't meet all of them you can still update using your computer.
I don’t know what to do to allow my iOS 15 to install