I suggest trying Chime. My niece used this when her and her friends went on vacation to Domincan Republic and it worked well for her... and helped my sister with the long-distance bill

... but anyways its still new, but i guess its a texting service that lets you text for free to any mobile number in the US, and most of the carribean countries. I don't know exactly which ones, but i know dominican republic was one. You get an account by signing up at
www.chimenow.com/int and you can access your account on your PC, or get the apple app for it. Hope this helps! Have a great vacation
