First PCS Network in The United States
In the United States, Sprint PCS was the first company to build and operate a PCS network, launching service in November 1995 under the Sprint Spectrum brand in the Baltimore-Washington metropolitan area. Sprint originally built out the network using GSM radio interface equipment. Sprint PCS later selected CDMA as the radio interface for its nationwide network and built out a parallel CDMA network in the Baltimore-Washington area, launching service in 1997. Sprint operated the two networks in parallel until finishing a migration of its area customers to the CDMA network. After completing the customer migration, Sprint PCS sold the GSM radio interface network equipment to Omnipoint Communications in January 2000. Omnipoint was later purchased by VoiceStream Wireless which subsequently became T-Mobile USA. Sprint's original GSM network still forms the backbone of T-Mobile's wireless network in the Baltimore-Washington area.
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