How to clear iOS storage on iPhone
My IOS storage is only 8gb but it takes up more than half of the storage bar and system data is almost 18gb and IOS takes up more space but it is less than system data
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Here are some helpful articles that can guide you on how to free up storage space on your phone.
How to check the storage on your iPhone, iPad, and iPod touch - Apple Support
How to check the storage on your iPhone, iPad, and iPod touch - 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