For several years, Sprint's business has yielded disappointing results, as profits have been burdened by declining subscriptions to its cellular services. The most recent series of reductions at the company, headquartered in Overland Park, Kan., began in 2014, when the company put Claure in charge of turning things around.

Claure immediately began planning reductions in the staff. The company had "an extensive list of nice-to-haves and those are the first that are going to go," he said shortly after taking the job, the Kansas City Business Journal reported. "You cannot lie to your employees."

Most recently, the company disclosed in January that it was laying off 2,500 workers in U.S. call centers. After the new expansion, more people will be working phones for Sprint in the United States again, but not all of them will be working directly for the company.

Recently, subscribers have returned to Sprint, and the company was breaking even again this fall after having lost money every quarter for more than three years, according to Bloomberg.

"We thought it was the right time to make an even greater investment in U.S. jobs and opportunities, because that's good for the country," said Tovar. "If that improves the economy here in the U.S., that's good for Sprint."