As for AT&T, the carrier says it has completed upgrading one of its most troubled 3G areas. Work has been completed on the 850MHz spectrum for New York City's 3G service. According to its press release, AT&T has improved the voice quality in the region by 47%, adding new layers of frequency known as "carriers". The "carriers" have been added to all cell sites in Manhattan and as needed in the Bronx, Queens and Brooklyn. The carrier also added a mobile Wi-Fi Hot Spot in Times Square. Tom DeVito VP and GM for New York and New Jersey is quite clear about the carrier's goal in the area. He says, "Our goal is pretty simple; in the city that never sleeps, we're working 24/7 to make sure our customers have a great experience everytime they make a call, check e-mail, download a song or video, or surf the internet on their AT&T device." From 2007 to 2009, data traffic over AT&T's network has grown 5,000%.The upgrade in New York City should improve the carrier's performance not only on the streets of the Big Apple, but also inside the City's fabled skyscrapers where cell service of any kind is often hard to find.
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source: AndroidCentral (Sprint), AT&T via FierceMobile (AT&T)