"The proposed AT&T/T-Mobile merger is a single transaction that promises to get the ball rolling towards addressing each of these issues for our state and the nation," said Brewer, who joins two dozen other governors in backing the merger.
"At the very least, this deal is a springboard for launching American wireless service into the next generation."
The FCC is currently reviewing the transaction to determine whether it would adversely impact consumers. Opponents, including a number of public advocacy groups, argue the loss of low-cost competitor T-Mobile will lead to higher prices and less innovation in the wireless market.
The groups recently asked the Federal Communications Commission to hold public hearings on the merger around the country similar to the field hearing held in Chicago last year on the Comcast-NBC Universal merger.
But field hearings outside the Beltway are rare, and there is no expectation the FCC will comply.
This post was updated at 2:25 p.m.