https://phys.org/news/2018-11-apple-iphone-xr-best-selling-red.html

That said, it's only been about a month, so how sales hold up throughout the year remains to be seen. (Not that Apple is likely to break with its practice and reveal specific sales numbers.) By way of comparison, though, last year's most expensive iPhone, the X model that was the first to crack $1,000, became the best-selling iPhone overall after its release.

Joswiak spoke to USA TODAY ahead of World AIDS Day on Saturday, to promote the (PRODUCT)RED version of the iPhone XR, which was released at the same time as the XR models in other colors. This was the first time the RED version was available at the launch of a new iPhone and beforeWorld AIDS Day.