Apple shifted 47.8 million iPhones throughout the last three months of 2012, one million less than analysts had predicted.
The computer giant's shares fell 3% to $517 (£326) in extended trading after the release of the report.
More top news
Two people rescued from a car which plunged into a lake have died.
Wolf and Anita Gottschalk, who have been married for 62 years, cry every time they see each other in their separate care homes.
Apple has released a new security update after an activist's iPhone's was targeted by spyware.