In grant writing (or prohibiting) proposed acquisitions or mergers in an industry, government regulators consider a number of factors, including the acquisition's effect on concentration, ease of entry into the market, extent of ongoing price competition, and potential efficiency gains.In 2011, T-Mobile agreed to merge with AT&T at an acquisition price of $39 billion.However, facing opposition from the Department of Justice, the companies later abandoned their merger plans.IN 2011, AT&T's market share of the US wireless market was 26.6 percent, with T-Mobile 12.2 percent, Version 31.3 percent, Sprint 11.9 percent, TracFone 5.0 percent, US Cellular 3.1 percent, MetroPCS 2.3 percent, Cricket 1.6 percent and numerous small providers making up the remaining 4 percent.