I applied in-person. The process took 2 weeks. I interviewed at AT&T (Denver, CO) in Feb 2013
Interview
the phone interview was basic , the in person interview was technical , the managers were very nice. The process did not take very long and the offer was made in person
I applied through a recruiter. I interviewed at AT&T (San Ramon, CA) in Oct 2008
Interview
I was contacted by a Hiring Manager to come to Interview. The initial interview was at a hiring fair for AT&T. These are not common. I did a traditional interview with an Area Manager. I was asked to come for a second interview to take the Manager's Test and verbal interview with a Hiring Manager. I was then asked to come in to take the Engineer's Exam.
Interview questions [1]
Question 1
There is nothing like telephony. The most similar thing would be water (pipe) engineering. This interview/exam was from 2000, so things may have changed.