I applied online. The process took 4 weeks. I interviewed at AT&T in Jun 2013
Interview
After submitting an online application I received a follow-up email inviting me to a web interview. The web interview was with a recruiter and is basic first interview with questions about previous experiences, why you'd be a good candidate, etc. They do ask over and over if you are willing to relocate.
After the web interview, I was invited to an Interviewing Event in Atlanta, GA. Where the Mobility HQ is located. The day was very fun! Fast paced and very informational. After the interviewing day I was contacted by phone and offered the position.
Interview questions [1]
Question 1
No question was unexpectedly difficult, they do expect you to have many questions prepared for them though.