Thanks for the replies everyone
Sorry for the lack of info in the first post.
We will travel in a 4x4 and will travel from Vladivostok to London throught the stans etc and then from London to Cape Town.
To be honest, I'm not too concerned about us not having one if we're in a pickle. It is more a case of parents being able to get hold of us if something happens to them.
Has anyone used one of the so called world-wide sim cards, and if so, any feedback???
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