Can you call the Echo Dot from the iPhone Alexa app? They are both registered to me. When I try it rings, but will not allow me to pick up. I have the latest iOS on an iPhone 7 Plus and the latest Dot. When I call myself, the Dot rings but won't pick-up when I say "Alexa, answer call". I've tried various terms to get her to answer but she either doesn't respond or says there is no call. My app continues to ring until it times out.