Google Voice doesn't work in Canada, sadly. It's also not a VOIP app. Gmail calling might work, I've never tried, but I'd bet they don't have an iOS plug-in. You'd still be restricted to outgoing calls only.
That's Gmail calling. You can use it to dial out but not receive calls. Like I said, it might work on iOS, but you need the Google voice/video chat plugin and I doubt there is an iOS one. I could be wrong though.
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