Ah right, that does sound good. Good to know, thanks for the info.
Can you buy those in advance if you went to the Caribbean or something, or can you just pick one up when you're there and add it to your phone when you're there?
How does that work for tethering, can you tether a laptop to a phone which is dual simd?
What I use works really well mind (the mifi, it's tiny and light and battery last ages), and there's no real risks to it of some £700 bills which I've had a few times when had my phone setup wrong for roaming etc! I would be crapping my pants tethering my work laptop, e-mail and google drive to my phone these days. A couple of hours of that being set up wrong and I would be bankrupt