I'm all over Google Voice, the freakishly awesome (and free) Google service that lets me take my own phone number anywhere (plus a ton of other great features). But just cause I use my email carrier to make phone calls, doesn't mean I'd do the same on Twitter. A new third party app from Jajah will allow users to voice chat over Twitter just by first sending a message to @call @"username." Of course you could chat with your mom just by sending her an @call @"your mom's Twitter username," or we could all attempt to chat with Ashton Kutcher, too. I wonder how well that would go over?
We can already post pictures and upload video to Twitter, so enabling voice chatting service seems like the next logical step. The question remains though, would you make phone calls or chat over Twitter?