Rogers and Fido have launched Wi-Fi Calling with iOS 9. It comes with the Carrier update version 21.1. Right now I can see the feature in Settings > Phone > Wi-Fi Calling but can't enable it. Also you need to remove Rogers One Number for it to work, among other things listed below:
- Data blocking
- Ringback tunes
- Advanced Call Manager
- Teletypewriter
- Rogers One NumberTM