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…
