Friendly, fun environment. Great people, challenging work.
As with any large corporation, ideas take a while to implement and you have lots of bureaucracy to navigate.
Advice to Potential Interns
If you want a challenging place to work, where the people care about you, in a fun industry, with good pay, AT&T is an excellent choice.
Advice to Management
Keep the tone at the top focused on allowing anyone anywhere in the company to submit ideas and be justly compensated and promoted. The industry is always changing and even though such a large company typically can't support truly rapid changes, the closer it moves toward that pace the more opportunities for growth.