https://finance.yahoo.com/news/amazon-start-selling-latest-apple-183213161.html

IPhone unit sales barely increased in the fourth quarter from a year earlier, Apple reported earlier this month, even though the new flagship devices came out in the period. The smartphone remains the Cupertino, California-based company’s most important device, generating about 60 percent of quarterly sales and tying customers to other services such as Apple’s music and video streaming.

The two tech giants have clashed in the past.