I recently installed a SLS-BU10B Network Extender in my home network. It works OK with a Pixel 2 phone. However, for the iPhone XR phone it worse than before the extender. The iPhone shows 4 or 5 bars when not making a call. Dialing #48 does say that the phone is under Network Extender coverage. However, when dialing, the call either does not go through or it drops down to 1 bar. The extender appears to indicate 1 connected user at first but then shows 0 connected users for the rest of the call. Additionally, when people try to call there is often no ring and also no missed call indicated. Below is some more diagnostic information:
anon7, that is very strange that you are having issues connecting to the network extender with your iPhone XR. Let's work to get to the bottom of this. Based on the steps you have already taken the next thing I want you to do is reset your network settings. Once your settings have been reset I want you to reconnect to your Wi-Fi but make sure Wi-fi calling is disabled. Once you have followed those steps I want you to try making a call to see if you are staying connected. Let me know what happens.
I reset the iPhone Network Settings, but unfortunately, the same symptoms. I disabled WiFi calling. I also tried it before reconnecting the WiFi.