I have a 3 disc setup that works well throughout my townhouse. Unfortunately, WiFi calling on my iPhones does not work well when moving about the house. As soon as the wifi changes disc, the call is dropped and I have to restart the phone to get Wi-Fi calling working again. I saw a post about this being fixed via a firmware update for Wholehome on Android devices, but this firmware update has clearly not solved the issue for iOS / Apple devices. I have iPhone X, 6S and 6S Plus on O2 and Vodaphone. All with the same issue.