Earlier quoted context omitted.
FWIW - AT&T is now in SD. (grew up there, and still have family in the state).
And in Montana as well when they purchased Alltel in 2009.
Verizon purchased Alltel, but was required by the FCC to sell off 105 of the markets, which is where ATT stepped in and bought a bunch of those markets.
FWIW, my Alltel account was switched over to Verizon in 2009.