GRAFFICE is correct. The International Calling Plan from Verizon is NOT free. I too pay $4.00 a month and .35 per minute. I call Belize a lot and am down there about every 6 months now, so this is ideal.
While in Belize, it's .50 to send a text and .10 to receive it.
What IS free is that Verizon will automatically set your phone to International Roaming when you arrive in Belize, this is different then the calling plan. You will pay 2.85 per minute for any calls.
It adds up, too. My first phone bill w/o the calling plan was a shocking.