AT&T bought Centennial Communications Corp today for $944 million. The move was intended to improve AT&T’s coverage in the Midwest, Southeast and Puerto Rico. The purchase will add over 1.1 million customers to the company’s 79.4 million person base. The move follows Verizon and their purchase of Alltel last week.

AT&T assures Centennial customers that their service will be unaffected and they will enter into their billing system in time.