Hello SpyderRyder,
Welcome to the community!
It should be noted that while using Wifi for regular internet access abroad will not incur Fido Roam charges, there seems to be some misunderstanding regarding Wifi-calling. I'm not sure how people have gotten the impression that Wifi-calling does not use the networks. However, that is not true. While the calls and messages do not transmit via cellular towers, they still use the networks via the internet gateway (see image here). The cellular towers and Wifi are merely alternate means of accessing the networks. Calls and messages would not be able to complete or get sent/received without the networks. As such, using Wifi-calling is technically using Fido services. However, they have allowed certain usage to be free from additional charges. All the messages and calls you receive (from anywhere in the world) will be taken from your plan's voice minutes and messaging limits. As well, all Wifi-calling messages and calls you make to a Canadian phone number while abroad won't incur long-distance or roaming charges (see link above).
So, when abroad, all outgoing messages and calls to a non-Canadian number will count the same way as they do on a mobile network and will likely incur roaming charges. It should be also noted that outgoing Wifi-calls to a non-Canadian number outside the destination you are currently roaming in will incur applicable long-distance charges in addition to the Fido Roam daily charge.
Hope this helps 😀
Cheers
