Dialing 3 digit emergency numbers

I thought I would post this question here since many forumites travel extensively. I have been around and about with Verizon Wireless about the International Calling Plans. It looks like their Travel Pass is a good option for us since we rarely make phone calls on vacation, but want the option to do so. Travel Pass doesn't get activated unless you make or receive a phone call and its $10 per 24c hour period, just for the time periods in which you use it. My question to them is regarding dialing a 3 digit number for emergency services. One rep said to dial a + then the 3 digit number. One said to just dial the 3 digits since its like dialing a local number. I read on a forum that you can't dial 3 digits, just 10 digit numbers. Thankfully I have never had to do this, but would like to know how to do it just in case. Does anyone with Verizon Wireless have any experience with this? I have a Samsung Galaxy S6 if it makes any difference.

Thank you!

From what I understand, three digit EMERGENCY numbers are routed differently from other three digit numbers. Therefore, the host tower will recognize it as an emergency, and route it to LOCAL emergency services, rather than to your home country network. In the BVI the numbers are 999 or 911.

But there's at least a couple of super technogeeks on the forum who will no doubt clarify this.