Filed under: Misc. GadgetsWhat's that, you didn't know AT&T was based in Texas? Yeah, ever since all those mergers (re-)created AT&T, its HQ has been in the former SBC offices in San Antonio, which is why certain services tend to roll out there first. It looks like the Alamo City isn't quite big enough for Ma Bell, though -- it's just announced that it's moving its corporate headquarters to Dallas in order to be closer to the airport. Yes, the airport. Dallas-Fort Worth Internation is country's third-largest airport, and AT&T wants travel to and from HQ to be more convenient and cost-effectiv