DETROIT -- AT&T customers in Michigan are expected to experience improved mobile broadband coverage and voice performance as a result of continued investment by AT&T.

The company announced Monday network improvements made to enhance the wireless capacity and performance of its local mobile broadband network.

Since the start of 2011, AT&T has made more than 1,200 wireless network upgrades in Michigan. Some of the enhancements include:

* Deploying enhanced backhaul connections to more than 525 cell sites. Combined with HSPA+ technology, these backhaul deployments enable 4G speeds.
* Adding capacity or an extra layer of frequency -- which is like adding lanes to a highway -- to more than 550 cell sites in the following areas.
* Installing more than 20 new cell sites to improve network coverage.
* Upgrading more than 100 existing cell sites to provide faster mobile broadband speeds.

AT&T plans to support the build or upgrade of thousands of cell sites nationwide to increase network speed, coverage and reliability for both mobile voice and broadband services. AT&T also plans to install additional radio "carriers" at thousands of cell sites nationally this year, enabling new layers of spectrum capacity to carry larger volumes of mobile broadband traffic. Additional capacity helps support rising mobile data traffic volumes, which have increased more than 8,000 percent over the past four years.

AT&T recently launched "Focus: Detroit," which provides visitors a peek into AT&T's wireless network enhancements made since the beginning of the year. Enhancements include new cell sites, broadband speed upgrades, capacity upgrades and network connection upgrades. The site also provides a map of area AT&T stores, a map of area Wi-Fi hotspots, useful tips, a localized Twitter handle and device reviews. You can visit the site at http://focus.att.com/Detroit.

For more information about AT&T's coverage anywhere in the United States, consumers can visit the AT&T Coverage Viewer. Using the online tool, AT&T customers can measure quality of coverage from a street address, intersection, ZIP code or even a landmark.