Taiwan's Foxconn, the world's largest contract electronics maker, on Thursday said revenue in December dropped 12.3% year-on-year after production problems related to COVID-19 controls at a major iPhone factory in China's Zhengzhou.

The company in a statement said production at the major iPhone factory in China "basically returned to normal" in December. It did not elaborate. (Reporting by Sarah Wu and Yimou Lee; Editing by Christopher Cushing)