Note: When you turn off iCloud for an app or feature on a device, information stored in iCloud for that app or feature is no longer available on that device. However, it’s still available on other devices where iCloud is turned on for the app or feature. See How iCloud keeps information up to date across all your devices.
Set up iCloud on your iPhone or iPad
On your iPhone or iPad, go to Settings > [your name].
If you don’t see your name, tap Apple Account, then choose whether you want to sign in with another Apple device or with your Apple Account email address or phone number and password.
Tap iCloud, tap an app or feature, then turn on Sync this [device] or Use on this [device].
Tap See All (or Show All) to see more apps, then turn on the ones you want to use.
For an Apple Watch you pair with your iPhone: If you turn on iCloud for an app or feature on your iPhone, you can see information from that app or feature on your Apple Watch (if available). You can choose what information appears on your Apple Watch by changing settings in the Apple Watch app on your iPhone. See The Apple Watch app in the Apple Watch User Guide.
For an Apple Watch set up by a family member: You can use the Settings app on the Apple Watch to turn iCloud on or off for an app or feature.
Set up iCloud on your Apple TV 4K
On your Apple TV 4K, open the Settings app.
Choose Users and Accounts, then select your account.
If you haven’t signed in to your Apple Account, choose iCloud > Sign In, enter your Apple Account email address or phone number, then enter your password.
In the iCloud section, choose an app or feature, then turn it on or off.
Set up iCloud on your Windows device
To use iCloud for Windows, you must set up iCloud on an iPhone, iPad, or Mac, then follow these steps.
If you don’t already have it, download iCloud for Windows from the Microsoft Store. See the Apple Support article Download iCloud for Windows.
Note: Some iCloud features have minimum system requirements. iCloud may not be available in all areas, and iCloud features may vary by area. See the Apple Support article System requirements for iCloud. For information about features, go to apple.com/icloud/.