Your iCloud storage is used for iOS device backup, iCloud Drive, iCloud Photo Library, app data and documents stored in iCloud, and iCloud Mail. Many apps may take up the space of your device while using them. If you run out of space, you can buy more iCloud Storage.
To do this go to:
The good news is that iCloud storage prices are better than ever. Apple has revealed good news for iCloud Storage Prices is available from $0.99 a month for 50 GB up to $9.99 for 1TB, which are now way cheaper.
When you sign up for iCloud, you automatically get 5 GB of free storage. If you need more storage, you can upgrade to a larger storage plan. The price in different country is showing below: