 The company purchased MCI Communications's mobile businesses in 1986, followed by LIN Broadcasting in 1989, giving them widespread access in all of the major US markets.Partnering with AT&T as a technology provider, McCaw introduced their "Cellular One" service in 1990, the first truly national cellular system.AT&T purchased 33% of the company in 1992, and arranged a merger in 1994 that made Craig McCaw one of AT&T's largest shareholders.