Human: How to stop icloud from using cellular data for transfers on iphone? Assistant: 
Stop iCloud from Using Cellular Data for Transfers on an iPhone
1. Open your iPhone's Settings.
2. Scroll to the fourth group of options and select iCloud.
3. Tap iCloud Drive.
4. Scroll to the bottom of the page.
5. Slide the Use Cellular Data switch left to the "Off" position.