[Motel75]

Nice job! I have just a couple of minor quibbles:

I'm not sure it's preferable to buy a SIM card in the US compared to on arrival (point 6). It's usually far more expensive to do so, unless you get a bargain on eBay, and there can be problems with old SIMs, non-registered numbers, and the like.

In most cases, once in the destination country, you can go to any shopping area and pick out a SIM you like; you'll have the latest offers to choose from. There are only a couple of countries where this can be difficult (Switzerland), and sometimes you can get a real bargain, sometimes with an almost-free phone; English is not usually a problem. Perhaps it would be better to suggest (say) making a list of people who should have your phone number and have a contact person tell them once you know what it is.

Also, AFAIK, Europe is pretty much all nominally 230 V now; some of it was 220 before, and some 240, and they split the difference.

Travel Promise is a trademark, and you have to request it, so we might want to say something like "Vodafone has an option called Travel Promise that..."