https://www.techradar.com/news/iphone-x-is-best-selling-smartphone-of-2018-so-far

The iPhone X was the best-selling smartphone during the first quarter of 2018, but the iPhone 7 was shifting more than half as many more this time last year, new figures have revealed.

The handset was unveiled late last year alongside the iPhone 8 and 8 Plus and is the most expensive iPhone ever made.