Can you upgrade your phone to more storage?
Can you upgrade your iPhone storage?
iPhone 11, iOS 15
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No, the storage on an iPhone is a fixed size and can't be increased.
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
How to check the storage on your iPhone, iPad, and iPod touch - Apple Support
Manage your photo and video storage
Manage your photo and video storage - Apple Support
Clear Other storage on your iPhone or iPad
Clear Other storage on your iPhone or iPad - Apple Support