Jajah VoIP service is a very interesting, not so well known as others like Skype, but with a lot of added features that give you added a lot of power.
But soon begin to be better known, since they have reached an agreement with Yahoo! to be their supplier of VOIP in Yahoo! Messenger. This means that Jajah will be responsible for managing the platform that it will provide voice calls via the instant messaging system.
And not only can we make calls to other customers of Yahoo! Messenger, but also to conventional cell phones, both fixed and mobile lines. Hopefully a future client of Yahoo! Messenger renovated to incorporate these features, which allegedly Jajah will regain some ground against the omnipresent Skype. Let us hope that we the possibility of sending SMS messages from the application itself.

Related - cellphones: AT&T Cell Phones