T-Mobile amassed “unprecedented concentration of spectrum,” AT&T complains

Enlarge / A pigeon rests on a T-Mobile logo outside a mobile phone store, operated by Deutsche Telekom AG, in Munich, Germany, on Monday, Feb. 6, 2017. (credit: Getty Images | Bloomberg)

AT&T and Verizon are worried about T-Mobile's vast spectrum holdings and have asked the Federal Communications Commission to impose limits on the carrier's ability to obtain more spectrum licenses. Verizon kicked things off in August when it petitioned the FCC to reconsider its acceptance of a new lease that would give T-Mobile another 10MHz to 30MHz of spectrum in the 600MHz band in 204 counties. AT&T followed that up on Friday with a filing that supports many of the points made in Verizon's petition.

T-Mobile was once the smallest of four national carriers and complained that it didn't have enough low-band spectrum to match AT&T and Verizon's superior coverage. But T-Mobile surged past Sprint in recent years and then bought the company, making T-Mobile one of three big nationwide carriers along with AT&T and Verizon. T-Mobile also bolstered its low-band spectrum holdings by dominating a 600MHz auction in 2017.

"The combination of Sprint and T-Mobile has resulted in an unprecedented concentration of spectrum in the hands of one carrier," AT&T wrote in its filing to the FCC on Friday. "In fact, the combined company exceeds the Commission's spectrum screen, often by a wide margin, in Cellular Market Areas representing 82 percent of the US population, including all major markets."

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