Merry Xmas everyone!
I'm with Free mobile and just nipped back to Blighty and couldn't use the Internet due to the above message. SMS' and voice calls were fine but iMessages not (as they are carried via data I assume). I've done a bit of research and this errors usually occurs when you migrate get an old number. The carrier used in Blighty by Free is Vodafone. I cannot find anything on the Free website to help me and I really don't want to ring them with my villainous French!
Any solutions to this as I'm gong back to Blighty in a couple of days.