At the South By Southwest conference, mobile innovators announced custom versions of nightlife games and iPhone applications to dazzle the tech-savvy crowd. Unfortunately, many attendees haven’t been able to get a signal on their phones to try out the new applications. For the majority of the five-day digital conference, AT&T 3G users in Austin have been experiencing dropped calls, sluggish data services, and unavailable service because of an overload on AT&T’s network. It appears that AT&T wasn’t