Mobilicity in Canada. Coverage isn't great, but hopefully it improves. Fido used to have terrible coverage in Canada, but they've worked some kind of deal with the other carriers, so their coverage is now much better.
Here's a price guide: http://mobilicity.ca/plans/
I do the basic $25/mo plan, then $10/mo for unlimited cross-country calling (for family) and another $10/mo for unlimited data.
I'm not the parent, but if you were grandfathred in (or I've heard there are tricks to get it from scratch) T-Mobile has a $5 unlimited data plan (in the US). It doesn't include texting, but you can just use Google Voice.
Sorry for the late reply. Yes, that is the plan I'm talking about, but the article is incorrect. They never closed the loophole; they completely opened it.
Anyone with the $5 plan actually has free access to any data connection; T-Mobile doesn't even try to separate it from the other data plans. The only problem is they don't officially offer it anymore.
I've heard some people have managed to convince customer service reps to turn it on from scratch by calling with their SIM in a feature phone and saying they want an old cheap data plan that would support their old cheap phone for doing simple online tasks.
