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.
: Select a plan (e.g., 50GB, 200GB, 2TB, 6TB, or 12TB). how to buy gb for iphone
: Tap your Name (Apple Account) at the very top. The most common way to "buy GB" is through iCloud+