AT&T will invest around $1 billion on its global network in 2009, with an emphasis on mobility and on-demand apps.
Ron Spears, head of AT&T business solutions, said the carrier was "making good on its commitment to provide companies with the network-driven capabilities and applications they need" in the current economic environment.
Including the 2009 investment, AT&T will have spent more than $3 billion worldwide since 2006 on network and services upgrades.
AT&T this year plans to expand the delivery of network-based applications, such as managed hosting and content delivery, accelerate its roll-out of mobility services and further integrate IBM's global network operations.
In Asia, it will increase hosting capacity in Hong Kong and Tokyo and upgrade its Singapore "super" data center.
It will expand content distribution services in India and China and offer managed IP telephony LAN services in China, India, Philippines, Thailand, and Malaysia. It will establish a telepresence service in China.