See iOS versions.
"iPhone OS 2.0." YourDictionary, n.d. Web. 14 October 2018. <http://www.yourdictionary.com/iphone-os-2-0>.
iPhone OS 2.0. (n.d.). Retrieved October 14th, 2018, from http://www.yourdictionary.com/iphone-os-2-0
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