I got an email a while back from a company called Manifone, which on the surface, looks like yet another Jajah clone. You make cheap international calls by calling what amounts to "local" numbers for each of your contacts.

Their big selling point: they use a technology where your mobile operator won't bill you for the call unless it's actually connected to the party at the other end. Apparently, the "other companies" don't do this, meaning you pay for the mobile minutes through your carrier whether or not you connect to the party at the remote end!

Well, I guess that's some differentiation, but really, that's all you got? The rates I saw didn't even look that good, either.