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I approve! I have poor coverage in my area so this would be a game changer. Just discovered this feature exists in fact. I'll make sure my next phone has it. I'm sure it's already on their roadmap so let's hope they get it out soon!
Meh, I've just called a tech support from the Mobility departement few minutes ago (December 21th 2017) and he NEVER heard about this of his whole life, neither found any information about "Wifi Calling" or "HD Voice" on the Videotron's website so his guess was that Videotron wasn't supporting this feature. If you say it's suppose to come for 2017 well that only gives them 10 days left so I highly doubt it's gonna be there...
Even if I don't have coverage issues, just the fact that the voice quality is way better through VoIP rather than satelite, I absolutely want this feature. No idea then if the minutes through Wifi will count in your usage or not though.