iPhone 6s out of storage to update.m to 15.7.6
no storage to update iphone6s
iPhone 6s, iOS 14
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Here are some helpful articles that can guide you on how to free up storage space on your phone.
You can also update using a computer, it requires less space on your phone this way.
How to check the storage on your iPhone, iPad, and iPod touch - Apple Support
How to check the storage on your iPhone and iPad - Apple Support
Manage your photo and video storage - Apple Support
Manage your photo and video storage - Apple Support
Clear Other storage on your iPhone or iPad - Apple Support
Clear Other storage on your iPhone or iPad - Apple Support
Update using your computer -
Click on this link for instructions on how to update your phone using a computer
Update iOS on iPhone - Apple Support