WIFI Calling charges for international calls


More of a statement but looking into WIFI calling wile travelling. It appears if enabled within Canada WIFI calling would be free or simply incur any charges under your mobility account usage terms. Just wondering why Telus would charge for WIFI calling while traveling abroad when you can free download  multiple apps such as Skype and make international calls for pennies on the minute.   I'm in Mexico have two cell phones one with an international SIM card plus an additional Canada PEN (personal extra number). So I call forward my Telus phone to my International Canada PEN so I can still receive calls without any problems (about $0.40 minute but better than $10.00 per 24 our Telus easy roam) Funny thing is my Telus phone still rings even the cellular is turned off, WIFI calling is turned off and the phone is call forwarded. 

If you can use the internet to make a call you should only be billed for the data at most. 

I think in the future this WIFI calling will be the way to go just as if your visiting a webpage. Appreciate any feedback on this topic.