i dont have any space in my storage
i just want to get more space
in my phone
iPhone 7, iOS 14
You can buy iCloud Storage
But cannot buy iPhone Storage ,You may clear the storage you have .
here -->How to check the storage on your iPhone, iPad, and iPod touch
Here to upgrade iCloud Storage --> Upgrade to iCloud+ - Apple Support
Here to mange iCloud Storage —> Manage your photo and video storage - Apple Support