Voice in the Night (1934)

Tim Dale is the son of the president of a big-city telephone company and quits his job following a dispute with his father over company policy. He takes up polo playing. Circumstances force him to give up his polo-playing and take on the job of helping a small-town telephone company overcome a plan by a gang to force the company out of business. He calls in his telephone-company pals Bob Hall and Jack to aid him against the crooks led by Matthews and Jackson, working for crooked lawyer Thomas Benton.