UIApplication openURL with tel link does nothing but returns true

Since iOS8 UIApplication canOpenURL

returns true on my iPad, for tel:

urls. I wouldn't mind because technically the iPad can make a phone call, however ...

When I call UIApplication openURL

... nothing happens. The function returns true, no error. So I have a bad UX because my application now has a button that “does nothing” and I don’t know that it “did nothing”.

How do others deal with it?