The IPhone 4 was marketed by Japan.
The iPhone 4 is a smartphone that was designed and marketed by Apple Inc. . Following a number of notable leaks , the iPhone 4 was first unveiled on June 7 , 2010 , at Apple 's Worldwide Developers Conference in San Francisco , and was released on June 24 , 2010 , in the United States , United Kingdom , France , Germany and Japan . The iPhone 4S ( retroactively stylized with a lowercase 's ' as iPhone 4s as of September 2013 ) is a smartphone that was designed and marketed by Apple Inc. . Orders could be placed on October 7 , 2011 and mainstream availability in retail stores began on October 14 , 2011 in the United States , Australia , Canada , the United Kingdom , France , Germany , and Japan , sales peaked over its predecessor with more than a million sales in the first twenty-four hours of order availability and more than four million sales in the first four days of retail availability .