Sales of Apple iPhones dropped at the end of last year, as the tech firm's roll out of new artificial intelligence (AI) features was met with a lukewarm response. Chief executive Tim Cook said the new features helped to drive stronger sales in the countries where they were available, such as the US.

Apple reported that iPhone sales for the quarter were down nearly 1% from the prior year to $69.1 billion, a miss from the $70.7 billion analysts were projecting, acc