Sales of Apple iPhones dropped 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 executives on Thursday forecast relatively strong sales growth, a sign the company will recover from a dip in iPhone sales as it rolls out artificial intelligence features. The forecast comes after Apple delivered a slight drop in iPhone revenues for the holiday shopping quarter and lagged Wall Street estimates,