AT&T said Thursday it invested more than $675 million to upgrade its wireless and wired networks in Georgia in the first half of the year.

The investments include new cell towers - base stations used to send signals to mobile phones - more antenna reach, improvements to its 4G LTE network for quicker data downloads and more Wi-Fi hotspots, the company said.

AT&T said the investment is part of a three-year Project Velocity IP plan to expand and improve its IP broadband networks.

Between 2010 and 2012, AT&T said it invested nearly $3.9 billion in its Georgia wireless and wired networks.