For : Tap Manage Account Storage > Change Storage Plan .
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. how to buy gb for iphone
Simply buying iCloud storage does not automatically clear your phone's physical memory. You must enable settings that tell your iPhone to use that new space efficiently. Buy iCloud+ or upgrade your current storage plan For : Tap Manage Account Storage > Change Storage Plan