Claim: IPhone 3G is similar to its predecessors.

The iPhone 3G is a smartphone that was designed and marketed by Apple Inc. . It is the second generation of iPhone , and was introduced on June 9 , 2008 , at the WWDC 2008 at the Moscone Center in San Francisco , United States .   The iPhone 3G is internally similar to its predecessor , but included several new hardware features , such as GPS , 3G data and tri-band UMTS/HSDPA . The device was originally loaded with the concurrently launched iPhone OS 2.0 . In addition to other features -LRB- including push email and turn-by-turn navigation -RRB- , this new operating system introduced the App StoreApple 's new distribution platform for third-party applications .