Aiming to keep up with the ever-changing demands of the volatile communications business, AT&T has quietly built one of the world's largest and most extensive corporate universities over much of the last decade.

With an annual investment of $250 million in workforce training, AT&T University provided more than 23 million hours of learning in 2015 alone, according to John Palmer, senior vice president and chief learning officer for AT&T Inc. (NYSE: T). AT&T University has handed out 120,000 course completion badges to its employees over just the last 18 months.

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