CHANGE AT THE TOP: T-Mobile USA’s CEO has resigned and its chief operating officer is filling in while the company searches for a replacement.

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THE REASON: Philipp Humm was an executive at the German parent company, Deutsche Telekom AG, before taking the U.S. job. The company says he has left to “pursue a career outside of Deutsche Telekom” and rejoin his family in Germany.

THE CHALLENGES: Humm took the reins in 2010, with a mission to reverse the slow slide of the business without help from Deutsche Telekom. But revenue continued to decline every quarter of Humm’s tenure.