AT&T announced the pricing and launch details for the iPhone 3G today

As already announced at the WWDC 08, the iPhone 3G will be available for $199 for the 8GB model and $299 for the 16GB model. These prices require two-year contracts and are available to the following customers:
- iPhone customers who purchased before July 11th
- Customers activating a new line with AT&T
- Current AT&T customers who are eligible, at the time of purchase, for an upgrade discount.

Existing AT&T customers who are not currently eligible for an upgrade discount can purchase iPhone 3G for $399 for the 8GB model or $499 for the 16GB model. Both options require a new two-year service agreement. In the future, AT&T will offer a no-contract-required option for $599 (8GB) or $699 (16GB).

Current AT&T customers who are upgrading to iPhone 3G will pay an $18 upgrade fee and new AT&T customers will pay the standard $36 activation fee.

iPhone 3G customers can choose from four individual AT&T Nation plans, which bundle voice and unlimited data (e-mail and Web browsing):
- AT&T NationSM Unlimited: Includes unlimited Anytime Minutes for $129.99 a month.
- AT&T Nation 1350: Includes 1350 Anytime Minutes and unlimited Night & Weekend Minutes for $109.99 a month.
- AT&T Nation 900: Includes 900 Anytime Minutes and unlimited Night & Weekend Minutes for $89.99 a month.
- AT&T Nation 450: Includes 450 Anytime Minutes and 5,000 Night & Weekend Minutes for $69.99 a month.

Unlimited text messaging can be added for an additional $20 ($30 for FamilyTalk plans of up to five lines); $15 (1,500 messages), or $5 (200 messages).

The iPhone 3G goes on sale at AT&T retail stores at 8 a.m. local time on Friday, July 11th.
More details on the AT&T iPhone page.