I applied through college or university. The process took 2 weeks. I interviewed at AT&T (San Francisco, CA) in Nov 2011
Interview
3 to 5 interviews. Screen call, then manager call. Interview with sales team. Interview with Director. The process was fairly simple. They go over background, and why AT&T. They challenge you to sell them on the network of AT&T, as a mock sales call. They want to see how you deal with pressure.
I applied online. The process took 5 weeks. I interviewed at AT&T (Las Vegas, NV) in Aug 2014
Interview
Meet with hiring agent. Then interview in store.. Then drug test.. And background check.. Took a while for everything to go through. Well worth it.. You'll love working for at&t