We use Wi-Fi calling exclusively as there is no cellular signal at our home. Dialing numbers manually works great, but Siri doesn't recognize that we can make calls over Wi-Fi.
Telling Siri "Call John Doe"
Results in Siri Replying: "Calling John Doe... Oh uh, I can't seem to find a good connection. Please try your phone call again when you have better cellular service"
Please T-Mobile work with Apple to get this fixed! It's an Accessibility issue.
If you're having the same issue, click here to report this issue to Apple Apple - iPhone - Feedback
Good news guys it looks like Apple finally fixed this issue in iOS 10! Just tested with Airplane mode enabled and wifi calling and was able to make a call with Siri. Yay
Retrieving data ...