https://arstechnica.com/tech-policy/2019/07/its-official-us-government-approves-t-mobilesprint-merger/

The Justice Department today announced its approval of the T-Mobile/Sprint merger as part of a settlement that requires the merging companies to spin off several assets to Dish Network.

The DOJ decided against filing a lawsuit to block the T-Mobile US purchase of Sprint, even though it reduces the number of major mobile network providers from four to three. In exchange for its approval, the DOJ convinced the companies to sell Dish spectrum licenses, wholesale network access, and Sprint's prepaid business including subsidiaries Boost Mobile and Virgin Mobile. Boost and Virgin both resell Sprint network access instead of operating their own networks.