If the states obtain an injunction before the deal is consummated, "that would bring things to a halt."
The companies agreed to expand mobile access and to divest the prepaid business Boost.
The move comes as rivals look to roll out new technology.
Veteran telecom executive Sunit Patel is expected to bring his integration expertise to T-Mobile as it combines with Sprint.
Tarek Robbiati — " a visionary leader and a pragmatic business operator" — replaces Tim Stonesifer at the HP spinoff company.
The announcement comes as T-Mobile seeks approval for its merger with Sprint.
Sprint, Daseke, PwC Public Sector, North Highland, Diamond Offshore Drilling, Merit Medical Systems, HubSpot, United Rentals, MaxLinear, Depomed
Sprint, Office Depot, Avnet, Flexsteel Industries, PDC Energy, Bon-Ton Stores, Krystal, JAKKS Pacific, Alex and Ani, CONMED
Former Sprint CFO Joseph Enteneuer joins the toymaker as it attempts a turnaround after struggling "to keep pace in the digital arena."
The electronics retailer blamed its filing on the "surprisingly poor performance of mobility sales" despite its co-branded stores with Sprint.
The companies had, in fact, previously announced they would be bringing 8,000 jobs to the U.S.
The cash-poor wireless carrier has turned to creative financing techniques to fund investment in its network and pay off debt.
