The first model of Apple's smartphone, which debuted in June 2007. The 2G does not refer to the phone itself, but to the second generation of the EDGE data service that it supported. See iPhone.
"iPhone 2G." YourDictionary, n.d. Web. 16 August 2018. <http://www.yourdictionary.com/iphone-2g>.
iPhone 2G. (n.d.). Retrieved August 16th, 2018, from http://www.yourdictionary.com/iphone-2g