Unless there's no rogers signal either.
My house is pretty much a Faraday cage and in some spots Wind is actually stronger than rogers (zero rogers signal, wind barely makes it through)
But to answer OP, I use my wind phone as emergency backup (had a couple days of disconnection last week, worked great. Speed's are a little slow because of my low signal, but still better than nothing.
If you're in a good signal area you can probably get 3mbps+ as I do at work.
If you're really lucky, you're near an HSPA+ tower, when you can get 10-12mbps (was surprised to see that one a couple months back