The US Federal Communications Commission (FCC) has restarted its informal 180-day review of the proposed $39bn merger between wireless carriers AT&T and T-Mobile.
The FCC halted its review in July after AT&T submitted additional information and plans on the merger, which will bring together two of the largest mobile service providers in the US.
The FCC said that the updated information has now been received, and the FCC will continue the 180-day process which has 83 days left to run.
"We have now received AT&T's answers to our specific questions as well as AT&T's confirmation that it believes our record is complete with respect to the models," the FCC said in a letter to AT&T.
"Based on this understanding, we are restarting the informal clock effective today."
Opponents of the proposed acquisition had expressed hope that the delay pointed to a rejection of the deal.
"We are glad the Commission has decided that AT&T has had more than enough chances to make its case, and is restarting the clock on the merits," said Public Knowledge president Gigi B. Sohn.
"Now that AT&T has conceded that it has played its last card, it is time for the FCC and the Department of Justice to bring this proceeding to a close by rejecting the merger."
Cotton seedling freezes to death as Chang'e-4 shuts down for the Moon's 14-day lunar night
Fortnite easily out-earns PUBG, Assassin's Creed Odyssey and Red Dead Redemption 2 in 2018
Meteor showers as a service will be visible for about 100 kilometres in all directions
Saturn's rings only formed in the past 100 million years, suggests analysis of Cassini space probe data
New findings contradict conventional belief that Saturn's rings were formed along with the planet about 4.5 billion years ago