How to buy storage
I don’t have any storage at all and my phone is slow and won’t let me download anything at all
iPhone XR, iOS 15
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You can't increase the storage size on an iPhone, it is a fixed size.
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