I attempted to unify my iPhone 4s running ios6 beta 3 and my macbook air running Mountain Lion, hoping that I could text people via my MBA, and have it look like all communication was coming from my phone #. It appears now, from reading on this and the iOS dev forums, that this isn't possible. So i give up. But now all texts I send to other iphone users show as coming from my email address, even though I have my iPhone set to start new conversations via my phone number. Does anyone know how to fix this? I don't want people seeing my email address as the sender.