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Oklahoma is joining a multi-state federal antitrust lawsuit against Apple amid claims the tech giant has monopolized smartphone markets. The suit - which was filed in the District of New Jersey, alleges that Apple maintains an illegal monopoly over smartphones by selectively imposing contractual restrictions on hardware and software developers. Authorities complain that the current arrangement stifles competition in the smartphone market, potentially at the expense of consumers. Officials note that Apple's annual net income is currently the largest of any Fortune 500 company.