AT&T has altered the pricing of unlimited data plans for the 3G iPhone. Customers who purchase a new iPhone on July 11 will have to pay $30 per month for unlimited data, which is $10 more per month than what current iPhone owners pay. Over the course of a standard 2-year agreement, 3G iPhone owners will end up paying $40 more for the device and data services than the current generation iPhone. 3G iPhone business users will pay $45 per month. The 3G iPhone will, however, be able to access AT&T’s higher-speed 3G network, which the current iPhone cannot.