computers
There are many ways once you bring computers and the internet into the picture. Unfortunately that is not always possible or easy in the Dominican. And at best it's costly.
Unless you can afford a wireless laptop and tap into the hotzones for free. Then all you have to worry about is someone stealing your laptop...
If you have anything of value or something different, keep it under lock and key. One way or the other it will walk away from you.
Go cheap, buy a re-conditioned phone, preferably an "ugly" one and you will have guaranteed communication at a low price. Calling cards are about 100pesos for 12 minutes but that doesn't seem to matter whether you are calling Canada or local. It's still 12 minutes for 100 pesos.
Cheers,