One of Apple's best features is AirDrop, which easily lets you send files to other Apple devices with a simple tap. That said, it might be a little too easy to use since just about anyone can send a file to your iPhone, whether you know them or not. The difference between AirDrop as a useful tool among your contacts and an open channel for the entire iPhone community comes down to one setting. If you're receiving files from iPhones, iPads, iPod touches, or Macs that you don't know, it's because you currently have your AirDrop settings open to "Everyone." Your iPhone will appear on any other... more
