AT&T
is expected to upgrade its HSPA network to be able to download of 7.2Mb/s and is doubling its capacity.
AT&T has doubled the existing speed in two test markets via software upgrades will do the same in all its markets.
AT&T will start migrating its 3G networks to HSPA+ technology, which would offer peak download speeds of up to 21Mb/s.
In March, AT&T announced plans to invest between US$17 billion and US$18 billion this year, with its mobile operation earmarked to receive a significant proportion of this sum.
AT&T will eventually move on to LTE technology later than Verizon Wireless, which plans to commercially launch LTE networks next year.
"We expect AT&T's results to reflect wireline continuing to be pinched by the weak economy, while certain segments of the wireless business remain resilient," JP Morgan analyst Mike McCormack wrote in a report.