title: multiple phone number sms link fails in iOS
body: <p>I'm working on a contact app that allows the user to start a group message to their friends. </p>
  
  <p>I have a url like "sms:410-555-3029,630-555-9382" and it works on Android. When I press the link in the iPhone (iOS 11) It redirects to iMessage with just the first number: "410-555-3029,". All subsequent numbers after the first one are lost. I tried using "mms:" as a prefix, but that wasn't recognized.</p>
  
  <p>Anyone have any idea how to create a group message link with iOS?</p>
  
  <p>Thanks!</p>