Rob_benton said:
It does have to be registered to your home address and then won't work anywhere else. I tried.
The performance was mixed. You have to have a good speed or it suffers with other devices being used in the house.
I now use the wifi call on my iPhone instead. My own opinion is they are not worth it now with wifi calling.
I used wifi calling on my work phone and it was rubbish, dropped calls and nobody could tell what I was saying... that's with >50mbps internet connection. I can't use wifi calling on my tmobile phone though, hence am looking for a signal box.