Mail Links

  1. <a href="mailto:frank@wwdcdemo.example.com">John Frank</a>
  2. <a href="mailto:foo@example.com?cc=bar@example.com&subject=Greetings%20from%20Cupertino!&body=Wish%20you%20were%20here!">mail To</a>

Phone Links

  1. <a href="tel:1-408-555-5555">1-408-555-5555</a>

FaceTime Links

  1. <a href="facetime:14085551234">Connect using FaceTime</a>
  2. <a href="facetime:user@example.com">Connect using FaceTime</a>

SMS Links

  1. <a href="sms:">Launch Messages App</a>
  2. <a href="sms:182-0000-0000">New SMS Message</a>

https://developer.apple.com/library/ios/featuredarticles/iPhoneURLScheme_Reference/Introduction/Introduction.html