I applied online. The process took 2 months. I interviewed at AT&T (Florham Park, NJ) in Feb 2011
Interview
telephonic interview with mentor, just talked about my research and interests.
Easy interview
Application
I applied through a recruiter. The process took 3 weeks. I interviewed at AT&T (Florham Park, NJ) in Jan 2014
Interview
Contacted by researcher at AT&T. Asked questions about my current research projects and explained the project for which they are seeking interns. Asked some basic technical questions.