AT&T's HD voiceover service is coming to Rockford, Chicago, and Kankakee-Bradley, Ill.
According to Next Generation News, these municipalities are just a handful of many other U.S. cities that will receive the service when it's released May 23.
The company also plans to implement the technology in other parts of Illinois, Indiana, Minnesota and Wisconsin on a select and limited basis.
An AT&T spokeswoman previously told Computer World the addition gives consumers a smooth technology experience.
"As demand for speed, connectivity and enhanced wireless services grows, the introduction of HD Voice on our all-IP 4G LTE network is just another way we're working to provide our customers with the enhanced services they need, while also effectively utilizing our spectrum," the spokeswoman said.
Verizon also hopes to foster long-term evolution for voice over via an interoperation partnership with AT&T's service.
A Verizon Wireless spokeswoman told Computer World the mobile carrier expects to offer the technology this year.
"We have said Voice over LTE (VoLTE) is coming in 2014 and we will have HD Voice using the AMR (Adaptive Multi-Rate) wideband codec, which we believe will be the industry norm, as part of VoLTE," Debra Lewis told Computer World.
Using a high definition handset that connects a cellular base station at the bottom of a cell tower, HD signals are transmitted to consumers' devices.
T-Mobile and Sprint launched voice over services of their own in 2013 through their 3G mobile networks.
T-Mobile offered the iPhone 5 with this technology the very same year. Sprint installed the service on the company's 3G CDMA network in late April, a company spokeswoman told Computer World. This included 100 United States areas.
AT&T customers will have the service available to them free of charge, although some restrictions may apply. Check out the company's website for more information.
