Iphone unit sales
I-phone Unit Sales 2007-2018
The following table shows the number of Iphone units sold each year between 2007-2018. The numbers are in thousands.

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The number of Iphone units sold by Apple in 2018 increased to 217.7 Million units from 216.8 million units in the previous year.
About Iphone:-
iPhone is Apple's line of smartphones that operates on its iOS operating system. iPhone includes Siri ® , an intelligent assistant, and Apple Pay, Touch ID® and Face ID® on eligible devices. In September 2018, Apple introduced three new iPhones - iPhone Xs, Xs Max and iPhone XR.
Xs and Xs Max feature a Super Retina™ OLED display, an all-screen stainless steel and glass design, faster processors and enhanced cameras. They were available from September 2018.
iPhone XR features a Liquid Retina™ LCD display in an all screen aluminium and glass design, and was available from October 2018. Apple’s line of smartphones also includes iPhone 8, 8 Plus, 7 and 7 Plus models. iPhone is compatible with the iTunes Store, App Store, Book Store and Apple Music for purchasing, organizing and playing digital content and apps.
Sources:
Apple Annual Reports (form 10K)