The iPhone X was originally planned for 2018
https://www.theverge.com/2017/11/1/16593218/apple-iphone-x-2018-original-plan-moved-up-schedule-fingerprint-sensor
>Appleās release of both the iPhone 8 and the iPhone X has always been seemed a little strange, and now we know why: the company had originally intended to release the redesigned X in 2018, according to an interview with Mashable about the making of the new phone.
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