IPhone

June 29, 2007-
This is the original iPhone logo, and is still being used.

July 11, 2008 - June 19, 2009
This is the logo used for the 3G version. It was used till the 3GS was released.

June 19, 2009 - June 23, 2010
This is was used till the iPhone 4 was released in 2010.

June 24, 2010 - October 13, 2011
This logo is still being used, however it will be replaced on October 14.

October 14, 2011-
This logo is not being used yet, but it will be used on October 14 when the 4S will be released.