iPhone connectivity through WiFi
We have a house in the mountains with very weak cell coverage. I changed WiFi Internet service providers and now I can't make outgoing calls from my iPhone using WiFi. We changed from ATT DSL service to Optimum cable internet service. With DSL I was able to make outgoing calls using WiFi. Now I can't with Optimum. ATT says all iPhone settings settings are correct. And Optimum dose not think it is their problem. I can make and receive text and surf the net on my iPhone. But can't make or receive calls.
iPhone 11 Pro, iOS 16