I think there was an online challenge, then a friendly phone interview or call with a recruiter where they asked you about your activities. Then there was a short onsite where they asked behavioral and a technical question.
A LeetCode easy question about the minimum coins needed for giving change.
The following metrics were computed from 31 interview experiences for the AT&T Software Engineer (Internship) role in United States.
AT&T's interview process for their Software Engineer (Internship) roles in the United States is fairly selective, failing a large portion of engineers who go through it.
Candidates reported having very good feelings for AT&T's Software Engineer (Internship) interview process in United States.