The Big Three Canadian wireless carriers offer a wide variety of roaming add-on packages. Take a look at the comparison of these add-ons.
Experience Lisbon's excellent public transit system by talking the metro from Lisbon Airport to the city center.
Roaming allows you to stay connected and get information you needed when Wi-Fi is unavailable.
The 747 shuttle bus is a good option to travel between Montréal-Trudeau airport and downtown.