How to get iCloud With 50GB
How to get iCloud+ With 50GB
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Hello friend, you can do it from the settings on your iPhone
How to upgrade on your iPhone, iPad, or iPod touch
- Go to Settings > [your name] > iCloud > Manage Storage or iCloud Storage.
- Tap Buy More Storage or Change Storage Plan.
- Choose a plan and follow the onscreen instructions.
I am attaching these articles that will help you a lot
Upgrade to iCloud+ - Apple Support
iCloud+ plans and pricing - Apple Support