: Tap Upgrade to iCloud+ and confirm with Face ID, Touch ID, or your passcode. II. Maximizing Your Purchased GB

The most common way to "buy GB" is through iCloud+ . This monthly subscription expands your online storage beyond the free 5GB, allowing your iPhone to "offload" full-resolution photos and files to the cloud.

Increasing the gigabytes (GB) on your iPhone requires a distinction between and cloud-based storage . While you cannot physically add more internal GB to an existing iPhone, you can "buy" more space by upgrading to an iCloud+ subscription, which offloads data to Apple's servers. I. Purchasing Additional Storage (iCloud+)