Here's how you can change your availability for AirDrop sharing in iOS 7.
1. The fastest way to access AirDrop settings is to simply swipe up to open the Control Center.
2. In the Control Center, tap on AirDrop in the menu.
3. You have the following options:
AirDrop sharing can be quite useful, but it's also a good idea to adjust your settings if you aren't comfortable with the default option.