I have been to Denmark and Canada with the phone. Denmark I used a prepaid local sim ($27us for 3 gigs!!!) without problems
In Canada I had to allow roaming once the phone recognized it was in another country. A coworker had problems with his s5 that took an hour for Verizon to fix. I'll text him and see if he remembers.
One note, I tried to activate the traveler plan (or whatever verizon calls it) that let's you pay $2/day in Canada and Mexico to use your plan minutes, data, etc. I was told they couldn't do it since it is not a Verizon phone. I escalated and got them to discount am Intl plan, but still seemed dumb. Plenty of people but iPhones and bring them to Verizon...
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