Best answer by Goran
There is easy roam available as an option for 12 dollars a day that let's you use your plan as per normal. You'll be able to call back to Canada and to UK numbers.
Ipersonally suggest getting s Vodafone or something similar sim card. They have a prepaid "pay as you go 0" plan for one pound a day that gets you unlimited talk, text, and 500MB of data for 24 hours for example. It's much cheaper.