AT&T (T) has responded to criticism of its network by saying it's upgrading as fast as...

|By:, SA News Editor

AT&T (T) has responded to criticism of its network by saying it's upgrading as fast as possible, and is planning to push high-bandwidth users to reduce usage - but despite climbing wireless data revenues, financials indicate the company has spent less on network buildout every quarter since the iPhone's (AAPL) launch.