My iPhone full storage
Can you reset my iPhone storage
iPhone 6s Plus, iOS 14
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See this Apple articles below
Clear Other storage on your iPhone or iPad
https://support.apple.com/en-us/HT211686
How to check the storage on your iPhone, iPad and iPod touch
https://support.apple.com/en-gb/HT201656
If you need more space for an update on your iPhone, iPad, or iPod touch
https://support.apple.com/en-us/HT203097
What's the difference between device storage and iCloud storage?