This.They don't answer the phone, tried for hours in the past, email them and tag as important and they will reply within 24hrs or so, have a feeling RWG is just a couple of people and a billing server.
Emailed them yesterday and got a response within an hour. I've recently ordered their Big Data Sim which I intend to use on a forthcoming trip to France. They confirmed that this is all that's required and not the Global Sim that many people seem to be ordering. The Global Sim is for countries outside of the EU. Their regular Data Sims are good for EU roaming.