That's where my wife is from, please let me know how your experience goes for future reference. I don't recall data sim's being that cheap though.The Google voice VoIP is now live for all users in US. Select WiFi and mobile data in Make and Receive calls settings. That setting only affects calls with gv app, not the phone dialer.
Just in time to try out for my trip to the Dominican Republic where a data sim is like 3.00.
I wonder if there is any real difference between using Hangouts to answer all calls and Hangouts dialer to make them.
Since I have TMobile, I can also use their app, digits to get my US cell phone with a DR data SIM.
That and 3cx extension on my cell should ensure that I continue to bug my office during my vacation!