How to Turn Off iCloud Drive on an iPhone

Open your iPhone's Settings. Do so by tapping the grey gear icon on one of your Home screens (it might also be in a folder named "Utilities").

Scroll to the fourth group of options and select iCloud.

Select iCloud Drive.

Slide the iCloud Drive switch left to the "Off" position. It should turn grey, signifying that your iCloud Drive feature is now turned off. The iCloud Drive app, which will be on one of your Home screens, will also disappear when you turn off iCloud Drive.