See iOS versions.
"iPhone OS 1.0." YourDictionary, n.d. Web. 11 November 2018. <https://www.yourdictionary.com/iphone-os-1-0>.
iPhone OS 1.0. (n.d.). Retrieved November 11th, 2018, from https://www.yourdictionary.com/iphone-os-1-0
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