Apple files $1 billion suit against chip supplier Qualcomm

Apple Inc filed a $1 billion lawsuit against supplier Qualcomm Inc on Friday, following a U.S. government lawsuit which accused the chip maker of using anti-competitive tactics to maintain its monopoly of a key semiconductor in mobile phones. Qualcomm is a major supplier to both Apple and Samsung for "modem" chips that help phones connect to wireless networks. Together the two accounted for 40 percent of Qualcomm's $23.5 billion in revenue in its most recent fiscal year.