The world's biggest cellphone maker, Nokia, is suing US company Apple, claiming it has infringed its patents on cellphone technology.
The BBC reports the legal action covers 10 patents which Nokia says Apple has breached with its massively popular iPhone.
Nokia said it had not been compensated for its technology. The claims involve wireless data, speech coding, security, and encryption.
Nokia said the breaches applied to all models of the iPhone since its launch on 2007.
Earlier this month, Nokia posted its first quarterly loss in a decade amid falling sales.
The BBC reports the company has invested approximately 40 billion ($US60 billion) in research and development during the past two decades.
Meanwhile, Apple reported profits of $US1.67 billion in the three months to 26 September - partly due to a 7% growth in iPhone sales.
Apple's shares dipped after news of the action broke.