I want to update my iOS to 15.1
How to update my iOS to 15.1
iPhone 6s, iOS 13
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what's stopping you?
if your details are correct and you are still running iOS 13, you may want to consider using a computer to do the update
have you read thru this support article for updating?
Update your iPhone, iPad, or iPod touch - Apple Support
need more storage for update?
If you need more space for an update on your iPhone, iPad, or iPod touch - Apple Support
issues?
Updating iOS: common issues and solutions - Apple Community
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