(Apple brought the URL scheme query limitations into iOS 9.)
Usually, this happens on simulator, try on device.
If it also happens on device,
- go to info.plist, add key “LSApplicationQueriesSchemes” with type “Array”, under it, add a item with type string, and add the URL Scheme (e.g. tel) as value.
- or, open the info.plist file with external editor, add following code into the info.plist file:
<key>LSApplicationQueriesSchemes</key> <array> <string>Your Scheme</string> </array>