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.
I applied online. The process took 4 weeks. I interviewed at AT&T (Atlanta, GA) in Feb 2014
Interview
The hiring process overall went smooth. There are two stages, the first is an initial phone interview about resume experience and a couple of behavioral questions. The second stage was an on-site interview where the manager asked a lot of situational questions to see how I would be able to answer and describe experience that could help AT&T.