January 9, 2007: Announcement of iPhone at MacWorld

June 29, 2007: iPhone Ships with iPhone OS 1 and Web Apps

March 6, 2008: Release of iPhone OS SDK

July 10, 2008: iPhone OS 2.0, App Store (500 apps)

January 27, 2010: iPad Announcement

April 3, 2010: iPad Ships with iPhone OS 3.2

June 21, 2010: iPhone OS 3.2 succeeded by iOS4