Caribe Blu's internet worked great for calls, we did 12days in the yucatan last fall and started in Coz with Caribe blu/Blue Angel. We called our girls everyday for 20-30min and called local resorts (at ~4c per min for mexico calling) and still have $5.63 left out of $10 of credit. We were on the 3rd floor directly above the lobby and could still use the wireless. There were times that 3 of us were on laptops with Skype making calls at the same time with no issue. It surprising how many locations in Mex have dsl and can support this type of calling. I've picked up a little self-contained linksys phone with skype loaded on it and will use it on the next trip (no laptop needed)