How can I turn on / off AirDrop?

How can I turn on / off AirDrop?

You should disable AirDrop if you don't use the wireless peer-to-peer file sharing feature often. Doing so will stop your phone from constantly searching for other iPhones or iPads nearby, and help you get more use out of your battery. You can disable this feature by opening Control Center (swipe up from the bottom of your display), and double tapping on the AirDrop logo.

Comments

Double tapping the AirDrop logo to disable it doesn't appear to work on an iPhone 5s running iOS 10.3.2. Any other suggestions?

You may want to check your restrictions. Open settings > general > restrictions. Hopefully that helps.