Background noise during phone calls, which raised customer complaints, was caused by a defective component in the microphone, spokeswoman Theresa Parenteau for Nokia Enterprise Solutions unit told Reuters on Tuesday.
"Although the issue is now rectified it has resulted in more limited availability than originally anticipated in some markets," she said.
When Nokia unveiled the phone in February 2007 it said it would start selling it in the second quarter in selected markets, with volume shipments coming in the July-September quarter.
