The CEOs of Sprint and T-Mobile held a meeting the day after the FCC said it will restart its informal 180-day merger review process.

“Great meeting today @Sprint HQ with @JohnLegere, @SievertMike & the @TMobile/@Sprintleadership teams. Much work to be done & we’re making fantastic progress so we are ready to unleash the power of the merged company once approved,” tweeted Sprint CEO Michel Combes.

Combes’ tweet came roughly 12 hours after the FCC said it will resume its informal 180-day clock on Dec. 4. The FCC paused its so-called shot clock review of the merger in September “following the submission of new economic and engineering modeling by the Applicants.”

Continued the FCC: “On November 6, 2018, the Applicants filed a new econometric study with the Commission. The new study describes itself as a ‘merger simulation offer[ing] an economically coherent framework, grounded in detailed industry data, for understanding the competitive significance of the proposed merger.’ The analysis represents a substantial body of new material on economic issues central to the review of the proposed transaction. It relies on a newly submitted data set and new methodologies to reach conclusions about the specific effects of the transaction not previously in the record.”