Are people having success with this?

It appears MJ (and other apps) allows you to call free in Canada & US but only internationally if the phone you're calling has the app. And reading MJ reviews, it appears that you have to pay an annual fee? I need to call people who don't have the app (can't or won't).

I can text free internationally with textme2. Unless I find an app that will let me call internationally with no extras or app restrictions, I'll stick with my cheap Lime while in Jamaica and use wifi for emailing.