Replacing its $20 add-on iPhone EDGE network data plan, AT&T today announced that 3G data plans for the iPhone 3G will cost $30 per month for consumers and $45 for business users, in addition to the separate cost of any voice plan. The new pricing raises the minimum two-year cost of an AT&T data service contract from $480 to $720, with the business user plan costing $1,080 over two years, offsetting the apparent price drop of iPhone hardware from $399 to $199. AT&T’s new data service will enable U.S.-based iPhone users to achieve transfer speeds of roughly 2.8 times current EDGE speeds, slower than the faster 3G data speeds offered by other telecom companies; however, the plans will offer “unlimited” 3G data service use. AT&T will remain the exclusive service provider for iPhone hardware in the United States, initially offering its 3G services in 280 major U.S. markets, with a planned increase to 350 by year’s end. Full details are found in an AT&T iPhone 3G press release.