WITHOUT ANY ASSISTANCE (and without being prompted), Dylan (7) just called my mobile phone in Ireland by asking our Amazon Echo Dot in the kitchen. I didn't think Irish phone numbers were configured for that service.
But after a little cross-check, I realised the voice call was simply a five star VOIP service tucked inside my handset's Amazon Alexa app. This means anyone with an Amazon Echo device who has me in their contact list can ring my mobile phone. I'm fascinated by the quality of the call and the natural language that makes all of this so simple.