Flossie I sent an email about 1:00pm UK time but have not got a reply. Really don't want to make a $40.00 call for 1 minute.
If you have a smart-phone then if you install Signal you get secure messaging over wifi / data but also encrypted calling over wifi / data at no cost and often better quality call than with normal mobile reception. Obviously both you and the other caller both need the software installed.
https://signal.org/install