Dish has already spent years and billions of dollars accumulating wireless spectrum, but it has yet to build its own network. And prior to the deal, it hadn't made a major announcement about any plans to do so.
By purchasing Sprint's prepaid business, getting additional airwaves and adding the ability to begin offering service on the T-Mobile network while it builds its own, Dish has an easier and more cost-effective path to finally become a wireless competitor.
That is the plan -- though it's unclear what the service will look like beyond utilizing Sprint's prepaid business and retail stores.
Under the deal, Dish will pay $1.4 billion for the prepaid businesses and $3.6 billion for the 800MHz spectrum, which is coveted because it has great range and can go through walls, even if it can't carry super-high speeds. Dish already has spectrum holdings in the 600MHz and 700MHz bands, as well as some midband holdings that'll allow for greater speeds, though it doesn't have the same amount of range.
Still, Dish executives are adamant the company will be a big player in the 5G mobile market.
"With the close of T-Mobile and Sprint, Dish is one step closer to becoming the nation's fourth facilities-based wireless carrier," Jeff Blum, a senior vice president at Dish, said in a statement after the companies announced the close of their merger.
"We are eager to welcome Boost customers, employees and dealers," Blum continued. He said the company is looking forward to "delivering lower prices and increased competition in the prepaid market." And he emphasized that the company is "committed to bringing full, standalone 5G to America."
The Boost prepaid brand will give Dish immediate access to a mobile business with about 9.4 million subscribers. It will operate as an MVNO, or mobile virtual network operator, by leasing access to the Sprint and T-Mobile wireless networks and reselling the service under the Boost label.
But when it comes to 5G service, Dish is essentially building a wireless network from scratch. Its plan is to combine the spectrum it owns with spectrum acquired from Sprint and to use new network technologies to build a 5G mobile network at the fraction of the cost of its bigger rivals.
The company has told Wall Street it only intends to spend about $10 billion to build its 5G network across the US.
But many analysts are skeptical that Dish will be able to achieve the projected cost savings and execute on its new network build within the promised timeline.
The prepaid Boost service should be up and running under Dish's management very quickly. Blum said in a statement after T-Mobile announced the close of the merger that T-Mobile has 90 days to divest the Boost assets to Dish, once the Justice Department signs off on the consent decree.
In December, Ergen told a federal judge that his company would offer wireless service within 30 days of the deal closing.
Dish executives have promised the new Boost will be "disruptive." Beyond that, they've offered no details. The big difference is that the "new" Boost service will also be able to use T-Mobile's wireless network, which will greatly expand coverage for Boost customers.
For years, Dish has been accused of hoarding valuable wireless spectrum. The company had until March 2020 to utilize its wireless airwaves or risk losing its licenses.
But as part of the agreement, the company got an extension to June 2023, by which time it pledges to have a 5G network of its own that'll cover 70% of the US population.
Ergen told the judge in December that the company would only cover about 20% of the population with 5G by June 2022. That's about all the company has said about progress toward its goal.
Last month, the FCC approved deals between Dish and its wireless competitors -- AT&T, T-Mobile and Verizon -- to allow those companies to temporarily lease some of its unused wireless spectrum to deal with potential surges in network usage. The agreements allow these companies to use Dish's spectrum for 60 days to help shore up their 4G LTE networks.