MobileVOIP lets you log in with your registered Betamax credentials and offers the option to use your existing VoIP credit from your smartphone. The downside is that anyone with the app and your credentials can call anywhere and talk for as long as they like on your nickel using any of your registered CallerIDs.

But anyone with your Betamax creds can use ANY smartphone and the Betamax app to make calls on your nickel, whether YOU use the app or not.

Even if you have a super-safe IncrediblePBX setup which you use for Betamax calling, as soon as anyone has your credentials, they can call at your expense using not just the app, but their own Asterisk setup or any SIP hard or soft phone …