How yo buy Storage

Sorry, you don't. An iPhone's storage is a fixed size and can't be increased. If you need more room, you will have to delete something.

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 and iPad - Apple Support

Manage your photo and video storage - Apple Support

Clear Other storage on your iPhone or iPad - Apple Support

Hi suavetta,

The iPhone's built-in storage is fixed, and unfortunately cannot be increased without switching to a new device. You can manage your iPhone storage here: How to check the storage on your iPhone and iPad

If you mean to purchase iCloud+, you can see this page: Upgrade to iCloud+

Hope this helps!