In Kentucky, Ohio, and West Virginia, AT&T is looking to pick up three lower 700MHz C Block licenses. The nation's second largest carrier is looking to improve its service and add capacity in the three states. But T-Mobile says that FCC rules require that the deal goes through an "enhanced review." Under FCC regulations, any deal that results in a carrier controlling one-third or more of low-frequency spectrum (1GHz or lower) in a single market must undergo a stricter review.
T-Mobile claims that AT&T owns 60% of the low-frequency spectrum in rural areas, and allowing the wireless operator to add to its portfolio would kill competition in those markets. So what does the Un-carrier want the FCC to do? In a letter written to the agency (which can be found in its entirety by clicking on the sourcelink), T-Mobile says that "If ever there were a transaction the FCC should deny under "enhanced factor" review, it is AT&T's proposed acquisition..."
The FCC shouldn't worry about what would happen to the low-frequency spectrum if it blocks AT&T from acquiring the airwaves. In its letter to the commission, T-Mobile says that it "stands ready to acquire the spectrum in these markets at market-based, non-foreclosure prices," and put it into use quickly.
source: FCC via FierceWireless