iPhone versions
iPhone X:
iPhone 8:
iPhone 8 Plus:
iPhone 7:
iPhone 7 Plus:
iPhone 6:
iPhone 6 Plus:
iPhone 5s:
iPhone 5c:
iPhone 5:
iPhone 4s:
iPhone 4:
iPhone 3GS or 3G:
iPhone 3GS and 3G look similar. iPhone 3GS has both video and still cameras, and iPhone 3G has a still camera only.
Apple has discontinued support for certain technologically obsolete and vintage products. See this Apple Support article for more details.