Receive unlimited calls and text messages on your Metro phone from Canada while you are within the United States.
Make unlimited calls and text messages from your Metro phone while you are within Canada to phones in the United States and Canada.
Send unlimited messages from your Metro phone to select countries while you are in either the United States or Canada.
This add-on also enables data roaming in Canada. You can use however much data was in your base plan as roaming data.
Metro says, "You must reside in the USA and primary usage must occur on our US network."