[markca]

Depends if you can afford the upgrade. Want an iPhone 3G S? Already have an iPhone 3G? Be prepared to pay $700 to upgrade [Updated] An iPhone 3G customer in most cases can early upgrade at $399 [16GB] or $499 [32GB].

http://www.crunchgear.com/2009/06/08/want-an-iphone-3g-s-alr...