AT&T supports the House GOP version of the spectrum bill, which restricts the FCC's ability to impose conditions on the companies that buy the spectrum and would prohibit the FCC from designating additional spectrum for unlicensed use.
A congressional conference committee could include the legislation, which could raise billions of dollars in auction proceeds, as part of a package to extend the payroll tax cut.
In their letter to conference committee lawmakers, the smaller firms urged Congress to set up the spectrum auctions, but said the House legislation "would substantially limit the FCC’s ability to promote competition and a competitive wireless marketplace for consumers throughout America."
In a blog post Wednesday, Jim Cicconi, AT&T's vice president of legislative affairs, said the smaller companies want the FCC to "stack the deck" in their favor.
“Auctions should be open, not closed," he wrote. "Any qualified carrier, including those on today’s letter, should have a chance to bid on any spectrum available in an auction."
He said the group's proposal "could not be called an auction with a straight face" and would cost the Treasury billions of dollars.
The smaller companies argued that restricting the FCC would reduce revenue in the long-run by limiting competition and discouraging smaller firms from participating in future auctions.