AT&T's big announcement got lost somewhere in the cracks of the onslaught of WWDC news yesterday. The carrier launched a new iPhone app this weekend that brings enhanced push-to-talk (EPTT) to the popular handset.
The app, which is aptly named AT&T Enhanced Push-To-Talk, allows iPhone 4S and 5 users to communicate quickly using next-generation VoIP technology to deliver one-to-one or group calls over AT&T's 3G and 4G networks...