T-Mobile announced recently it upgraded it 4G data and voice coverage in the Atlanta region, including Covington.

The company didn't specify the "technology advancements" it's made, but said its signal strength, in-building coverage and voice and data services have been improved.

The company said in a press release that it has more than 500,000 customers in the Atlanta area and said enhanced coverage will be seen in Roswell, Alpharetta, Covington, Conyers and Marietta, as well as the Hartsfield-Jackson Atlanta International Airport and the Georgia Dome.

"Customers in these metro areas can also bring their unlocked AT&T smartphones to T-Mobile and experience a significant speed boost on our network," said Neville Ray, the company's chief technology officer, in a blog post.

The blog post said internal tests of unlocked iPhone 4S devices running over 4G (HSPA+) on T-Mobile's 1900 MHz network recorded on average 70 percent faster download speeds than iPhone 4S devices on AT&T's network.