From the small part of the company culture I have seen, they seems very organized and engaged with their customers and employees. My supervisors made sure to always keep in contact with me and were accommodating and understanding.
The culture is very open and diverse. They care a lot about employee safety and well being. They give you a lot of opportunities to grow in the company, if that’s what you want, and they offer a lot to help you get involved in the community, donating to charity/cause or whatever you are interested in. They also care about your success... they have a program that can help you pay for school too.
AT&T prides it’s self on being diverse and promoting early. You are able to have opportunities as a minority candidate. The company wants to see the world reflected in their company as well as the people they serve.