Give your phone to a kid and they can distroy a data plan very quickly. If you have a high end phone, go onto youtube, and that is about it. 1gb/hour or more is very possible. Heck, I can do +1gb/month with just going to Reddit on my breaks at work.
Kijiji - the cheapest by far ONLY get an already unlocked phone that you can test with any SIM before you buy Get the model number - for example, not all Samsung S7 Edge phones are the same, there are many different models This link will tell you wha...
Ported from WIND/Freedom mobile in ~5min. It was very quick. I did have to hit the next button a few times here and there, but it worked. Generic mash it until it works method ftw!