An anonymous reader quotes a report from CNBC: Apple is suing Qualcomm for roughly $1 billion, saying Qualcomm has been "charging royalties for technologies they have nothing to do with." The suit follows the U.S. Federal Trade Commission's lawsuit against Qualcomm earlier this week over unfair patent licensing practices. Apple says that Qualcomm has taken "radical steps," including "withholding nearly $1 billion in payments from Apple as retaliation for responding truthfully to law enforcement agencies investigating them." Apple added, "Despite being just one of over a dozen companies who contributed to basic cellular standards, Qualcomm insists on charging Apple at least five times more in payments than all the other cellular patent licensors we have agreements with combined." Apple also alleges that once it began cooperating with Korean authorities' antitrust investigation of Qualcomm, the company withheld $1 billion in retaliation. Korean regulators fined Qualcomm $854 million for unfair trade practices in December.