Someone more knowledgeable will come along, but I think those 100 minutes, 100 text and 100mb (or whatever they might be) are for ALL phone calls. If you're using a Verizon SIM card with a US phone number and calling Europe (taxi maybe?) that to me seems long distance and then vise versa to call US.

You could also get on chat and get a quick response. I would just suggest asking multiple times to see if you get different answers.