No space available to run update
I can’t run updates on my phone because it doesn’t have enough storage. Before any of these actions can be done, my device must perform an update! what can i do?
iPhone 6s, iOS 12
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Is storage being used up by Other? If so follow their steps at Clear Other storage on your iPhone or iPad - Apple Support
If it's not an Other issue, follow the different suggestions at How to check the storage on your iPhone, iPad, and iPod touch - Apple Support