While you cannot technically upgrade the physical internal storage of an

: Go to Settings > [Your Name] > iCloud > Manage Storage > Buy More Storage . 2. External Accessories (Physical Storage)

This is the most common way to get more space for photos, videos, and backups. It syncs across all your Apple devices but requires a monthly subscription.

: Typically start at 50GB for $0.99/month, with options up to 12TB for higher fees.

: Use the "Optimize iPhone Storage" setting ( Settings > Photos > Optimize iPhone Storage ) to store full-resolution photos in iCloud while keeping smaller versions on your phone.