iPhone 7 Plus says no storage available

my iphone says no storage available

For device storage, see this Apple articles below:

If you need more space for an update on your iPhone, iPad, or iPod touch

https://support.apple.com/en-us/HT203097

How to check the storage on your iPhone, iPad and iPod touch

https://support.apple.com/en-gb/HT201656

Clear Other storage on your iPhone or iPad

https://support.apple.com/en-us/HT211686

What's the difference between device storage and iCloud storage?

https://support.apple.com/en-us/HT206504

You came from an article regarding backup, is your iPhone out of storage or where you are trying to back up to?