Verizon's Globality thing is very difficult for short trips. Just back from South America for a week, where I wanted to add Global. But my billing rollover date fell in that week. So I had to add all of the month before and all the month after the trip. Over $150 by the time they got through, despite most of an hour hassling the phone service guy..
I said no thanks and relied on local wi-fi instead, and left my phone in Airplane mode to avoid it trying to hose me.
As it turned out I was able to use Skype to call, though it was sometimes iffy.
