Here is a bullet list of iPhone Models and the corresponding announcement dates in the format {iPhone Models} - {Announcement Date}:

{first generation iPhone} - {January 9, 2007}
{iPhone 3G} - {July 11, 2008}
{iPhone 3GS} - {June 8, 2009}
{iPhone 4} - {June 7, 2010}
{iPhone 4s} - {October 4, 2011}
{iPhone 5} - {September 12, 2012}
{iPhone 5S and iPhone 5C} - {September 10, 2013}
{iPhone 6 and iPhone 6 Plus} - {September 9, 2014}
{iPhone 6S and iPhone 6S Plus} - {September 9, 2015}
{first generation iPhone SE} - {March 21, 2016}
{iPhone 7 and iPhone 7 Plus} - {September 7, 2016}
{iPhone 8, iPhone 8 Plus and iPhone X} - {September 12, 2017}
{iPhone XR, iPhone XS, and iPhone XS Max} - {September 12, 2018}
{iPhone 11, iPhone 11 Pro and iPhone 11 Pro Max} - {September 10, 2019}
{second generation iPhone SE} - {April 17, 2020}
{iPhone 12, iPhone 12 Mini, iPhone 12 Pro, and iPhone 12 Pro Max} - {October 13, 2020}
{iPhone 13, iPhone 13 Mini, iPhone 13 Pro and iPhone 13 Pro Max} - {September 14, 2021}
{third generation iPhone SE} - {March 8, 2022}
{iPhone 14, iPhone 14 Plus, iPhone 14 Pro and iPhone 14 Pro Max} - {September 7, 2022}