To the op. I have a wilson DB that was never installed. Switched to carrier with wifi shortly after purchase. Would sell at 50% discount over new. Pm me if interested.
In our world we use the Verizon network extender which does OK. It could be better. They have a new 4G one , but it says it requires 2 Mg upload, which we have 1. In the past , the wifi calling worked only if the person you were calling had the phone that would do the same. It wouldn't work if you called a landline as an example. Has that changed?
What about cheap WiFi signal boosters. My neighbor wants to use his Wifi signal from his router out in his man-cave which is about 60-70 feet from the router. The signal has to go thru several inside walls plus 3 brick walls to get to his man cave location. His ATT router wont reach that far thru all the walls.