T-Mobile has been dominating the industry lately with their rapid growth and popularity. T-Mobile has worked its way up to being the 3rd largest carrier in the U.S. In 4th place we have Sprint, but now Sprint and T-mobile are thinking about working together and becoming one large carrier.
T-Mobile could use that money to invest in 5G towers that promise us 10-100 times faster downloads. To make that happen, they would have to spend billions of dollars.
In 2013 Sprint was looking to buy T-Mobile, later AT&T tried to purchase them, but now its them who are trying to buy Sprint. At&t never got the deal because Federal Communications Commission and the Department of Justice had blocked it.