The chart shows what the carrier landscape in the U.S. would look like immediately if the $39 billion deal closes. You have to think ahead about what the impact of the deal would be. Right away, two of the nation's carriers would account for 84% of U.S. cell phone users which means that AT&T and Verizon would be able to control prices and do some serious damage to the smaller players like MetroPCS, Boost Mobile and, yes, Sprint.
It is this concentration of business in just a pair of companies that has the government so worked up. In theory, a combined AT&T/T-Mobile could cut prices at first, lowering them to the point that Sprint would have to close shop. Once that happens, AT&T and Verizon would raise prices even higher than they were at originally. Eventually, there would be only two major U.S.carriers. None of this even comes close to happening if the DOJ gets its injunction against the deal.
source: Chitika via BGR