T-Mobile announced this week that CEO John Legere will step down this spring and hand over the reins to President and COO Mike Sievert, a Legere protégé that has played a key role in the company’s transformation under Legere. The company said Legere would remain on the board. Since joining T-Mobile in 2012, Legere has led the transformation of the struggling company into the third-largest U.S. carrier, primarily by luring customers away from bigger rivals AT&T and Verizon with new pricing strategies, subscriber benefits and promotions. Leger has been instrumental in navigating T-Mobile’s pending $26.5 billion acquisition of Sprint which has been delayed by an antitrust lawsuit brought by several state attorneys general. The surprise announcement came amid speculation that Legere was in discussions to become the next chief executive of WeWork which is controlled by SoftBank. However, Legere said on Monday that he never had discussions to run WeWork. As for his future plans, Leger indicated that he is contemplating his next chapter at other companies that are interested in turning around their culture.