Hi I'm in the USA and now have the ability to call Mexico the USA and Canada using my Amazon Echo. To add a new number, just add the contact to your smartphone. The smartphone should have the Alexa app installed. Then you will be able to ask the Echo to dial a name like this: Alexa, dial Dave Wilson. In my experience it takes about an hour for new contacts to work with voice dialing on the Echo. Note that the new contact will not show up in your Alexa app contact list, unless that person also has an Alexa enabled device. The sound quality of the conversation is good at both ends. It is very convenient to be able to have a hands-free conversation, for instance while working in the kitchen. It's also useful for the elderly to be able to simply ask Alexa to place a call. And for the disabled it is a remarkably helpful function. I hope that Amazon will be able to add the ability to receive regular phone calls as well. Another useful feature would be if you could speak dialing commands, for instance while listening to a menu at the other end of the phone call, it would be great if you could say Alexa dial * 1 2 3 to respond to the menu prompts. I feel very fortunate to be living in a time when there are such wonderful technological advances. Even though the Amazon Echo is somewhat primitive, it is a glimpse of the future.