I updated my iPhone X carrier setting to Videotron 31.1. I have latest iOS 11.2.5. When I turn my wifi calling on, there is a msg showing up to contact Videotron , and it prevent me to enable it. I chatted with customer service and technical support on line, they could not solve it, they ask me to go to the store. I went to a store, they gave me a new SIM card , and tried on another iPhone to enable wifi calling, the same warning shows up, and it could be enabled. And I am so sad that they launch a function but I can’t use it in my account. And no one from Videotron can tell me what happenes to my service.
I have the same issue with both iphone 8 plus on my account. I spoke with technical support a few times and once with apple. In the end, technical support advised me that they are aware there is an issue affecting people who purchased their iphone outside of videotron and would call me back in a few days (hopefully with a solution)