Thanks. I'm not sure where I can buy one in the UK - Skyroam themselves are out of stock and neither of their named UK suppliers have it on their websites - but I'll keep an eye open. I read a review that said that the unlimited data is really 100MB per day at normal speed, then the speed is throttled:
http://uk.pcmag.com/skyroam-3gmate/4...skyroam-3gmate
But I'm unlikely to use more than 100MB per day when travelling.
I bought a good mifi a couple of years back but found it a hassle to find suitable sim deals, and to set up, in some countries - Canada in particular. A reliable virtual sim solution would be so much better.