alt Hacker NewsSeems a little sus. AT&T basically created the cellular mobile phone, and built up an analog, then digital system (D-AMPS/TDMA). AT&T sort of sold out the mobile business in 2004 to Cingular (BellSouth) because TDMA was a dead end. They then bought BellSouth back in 2006 and carried on with CDMA.
Those old phones had a long range. It was hard to make small ones because the old AT&T towers were much farther apart, up to 40km. Meanwhile, their competitors focused on smaller coverage areas (e.g. 2km or less for PCS) and better tech (CDMA), and it seemed to pay off.
This is a minor detail, but the "AT&T" that bought BellSouth in 2006 was the AT&T formerly known as SBC which bought the husk of Ma Bell and rebranded itself, i.e. the AT&T we have today.