Apple will launch its iPhone in the US on 29 June, it revealed in TV commercials that began airing on Sunday.
The much talked about iPhone combines the features of an iPod music and video player with those of a cellular telephone and will be available through AT&T Wireless Services.
AT&T, which acquired Cingular, hasn't yet announced details of how it will sell the phones, although long lines outside outlets are almost assured if the phone will be offered on a first-come, first-served basis.
Two models will be available. One with 4Gb of memory will cost $499 (£252) and a version with double the memory will cost $599, the companies said previously.
Announcement of the launch date ends a five-month guessing game that began on 10 January when Apple chief executive Steve Jobs unveiled the iPhone during his keynote speech at the Macworld Expo in San Francisco.
During the keynote Jobs touted the iPhone as "revolutionary" and demonstrated its features to an enthralled audience. Chief among them is Multi-Touch, a touchscreen display system that can differentiate and react to simultaneous touches from two fingers. Typically touchpanels cannot handle input at more than one point on the screen.
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