Hi there, I am new to the cell phone...just got my first one a few months ago. I have a Samsung galaxy...and I did get the Magicjack app last night. A couple of questions...if I take the phone to Jamaica with me, do I have to have my data "off" and free wifi on when attempting to make international calls using the app? I am worries that I will get home and receive an extra large bill....can I use it here in Canada to call USA and Jamaica?