O2

Is it possible to make WiFi calls on the p20 pro yet ? Cannot find the WiFi calling options in any of the settings

Is it yet possible to enable WiFi calling on the p20 pro ?

I am moving to a new house and have just found that I get no signal inside the property I believe this is because the walls are so thick, this means I get no phone calls or text messages.I have read that you can get a boostbox that can solve this pro...