Cellular One company officials say they will end their wireless service in Montana by the end of the month.
The Billings Gazette reports the company notified the Public Service Commission of its plans and negotiated special rates for their customers to move to AT&T.
PSC spokesman Gary Duncan says the company is selling assets such as cell towers to Sprint.
Cellular One announced in May it was discontinuing their service in Montana because it couldn't afford to upgrade its system.
Its stores in Billings, Helena, Great Falls, Butte, Kalispell and Missoula will become AT&T stores.