Dish Network was not the only company interested in T-Mobile-Sprint's divested assets
Three times the FCC had to temporarily halt its review of the deal
Under the rumored terms of the asset sale, Dish will sign a seven-year deal with T-Mobile to use the latter's network to sell wireless service. While Dish does this, it will start building its own 5G network using the spectrum it is paying $3.5 billion to T-Mobile for, and other airwaves it had won during an FCC auction. Those airwaves must be used by Dish before the end of March 2020 or else it risks losing them completely. Dish paid $6.2 billion during the same 2017 auction for 600MHz spectrum that saw T-Mobile spend $7.99 billion for 31MHz of low-band airwaves. Earlier this week, T-Mobile, Qualcomm, and Ericsson successfully completed the first 5G data call over this 600MHz spectrum. 
Charter was also interested in buying Boost Mobile and the spectrum offered by T-Mobile and Sprint
Before agreeing to the asset sale as a way to replace the loss of Sprint from the wireless landscape, the Justice Department appeared ready to once again stop T-Mobile from closing on a merger. Back in 2011, AT&T was going to pay $39 billion to buy T-Mobile and become the largest wireless carrier in the U.S. At that time, T-Mobile was the fourth-largest wireless operator in the states. The DOJ blocked the deal and it probably turned out to be the best thing that ever happened to T-Mobile, which is now the fastest-growing of the major U.S. carriers.
In 2014, both T-Mobile and Sprint met with FCC and DOJ officials to see how the agencies would feel about both companies combining. The short answer is that both were not in favor of such a combination and no deal was ever announced.
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