Pros
As a large corporation, AT&T quickly enters new markets; Upside potential of yearly bonuses & pension encourage long term employment; Size of AT&T can command favorable deals with vendors, especially in the benefits area; Heavy focus on personal accountability and delivery in co-workers; Prone to in-sourcing highly technical areas; Select teams working with all major IT technologies; Many employee concessions for high demand services, e.g. IPTV, cell, broadband, etc.
Cons
Very large bureaucracy; Extremely political management environment; Prone to outsourcing legacy technologies; Prone to divesting personnel associated with legacy technologies to an outside supplier; Very large base of 25+ years employees keeping benches warm; Extremely difficult to effectively balance Process between delivery & due diligence; Constant battles to cut the fat; AT&T preaches telecommuting to the outside world, but many internal teams limited in practice; AT&T preaches high technology products e.g. iPhones, WiFi, etc. to customers, but limited enthusiasm for employee concessions for high revenue services