Hi Data,
There are several, all basically offering you similar deals; basically they buy in sim cards from different countries and sell them on to you, at a mark up, naturally !. I travel regularly to Cyprus and top ups are valid for a year. Can't comment on other countries. You can also buy worldwide sims, usable in virtually every country. More expensive, but obviously, everything is relative. I probably paid @ £15 more than I would have done buying locally after arrival, but I was 'active' as soon as I got in the terminal & registered, so it was worth it to me.
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