iDevice model & year Determination: "iPhone", "iPAD" and "iPod Touch".

iPhone:
█A1203 | iPhone 2G (2007)
█A1241 | iPhone 3G (2008)
█A1324 | iPhone 3G (China - 2009)
█A1303 | iPhone 3GS (2009)
█A1325 | iPhone 3GS (China - 2009)
█A1332 | iPhone 4 (GSM - 2010)
█A1349 | iPhone 4 (CDMA - 2011)
█A1387 | iPhone 4S (GSM/CDMA - 2011)

iPod Touch:
█No Model Listed | iPod touch (1st generation - 2007/2008)
█ A1213   iPod touch (1st generation)
█A1288 | iPod touch (2nd generation - Sep 2008)
█A1318 | iPod touch (3rd generation - Sep 2009)
█A1367 | iPod touch (4th generation - Sep 2010)

iPAD:
█A1219 | iPad 1 (WiFi - Jan 2010)
█ A1337 | iPad 1 (WiFi/3G - Jan 2010)
█ A1395 | iPad 2 (WiFi - Mar 2011)
█ A1396 | iPad 2 (WiFi/GSM - Mar 2011)
█ A1397 | iPad 2 (WiFi/CDMA - Mar 2011)