AT&T will introduce a wireless voice service with clearer, more realistic sound next week in the Twin Cities and parts of three other states, a development that signals a big change in cellphone networks.
The new service, called High-Definition (HD) Voice, uses a wider range of frequencies to improve the sound quality of calls, said Mark Giga, an AT&T spokesman. It also provides a noise-cancellation feature that shuts out some background noise, making it easier to hear and be heard on the phone.
The service starts next Friday and will also be offered in Chicago, Milwaukee and other cities in Illinois, Indiana and Wisconsin, Giga said.
Consumers will need a new phone to use the HD Voice service. The first of those phones is the new Samsung Galaxy S4 Mini, but others will soon follow.
The HD Voice service won't cost anything extra, although customers will have to sign up to use it, Giga said. The price of the new Samsung phone isn't available yet.
Verizon Wireless plans to offer a similar HD Voice service later this year, said Karen Smith, a spokeswoman. Some existing Verizon phones will be able to be upgraded to use the planned HD Voice service, she said.
Behind the introduction of HD Voice lies a major shift in the cellphone system, one made possible by the introduction of 4G, or fourth-generation, cellular networks in the U.S. beginning in 2010.
Since 4G was introduced, AT&T and other cellular service providers have actually been operating two wireless networks at once: the traditional cellular network that carried voice calls and text messages for new 4G phones (and all communications for older 3G and 2G phones) and the 4G network that carried only the data for 4G phones.