I applied online. The process took 8 weeks. I interviewed at AT&T in Dec 2010
Interview
The hiring process was pretty standard. You definitely want to be on point with the questions. A lot of the questions pertain to how you would handle certain situations. Also make sure that wireless is an industry that you want to work in. They will want to get an idea if this is a job you want to make a career out of or just something that you're doing to bide time until you find another one.