June 21, 2010: Apple releases iOS 4, which introduces a range of productivity features as well as the FaceTime videotelephony service. The iOS 4 launch represents a big step forward for Apple’s flourishing mobile devices.
Due to the arrival of the first-gen iPad earlier in the year, iOS 4 also brings a transition from the mobile operating system’s original name, “iPhone OS.”

June 16, 2010: Apple reports a massive surge of interest in its latest smartphone, with iPhone 4 preorders racking up 600,000 sales on their first day.

