New York, California and seven other states filed suit in Manhattan federal court Tuesday in a bid to block the merger between telecom giants Sprint and T-Mobile, alleging that it would deprive consumers of the benefits of competition and drive up prices for cellphone services.

New York Attorney General Letitia James, who is leading the litigation, claimed in the lawsuit that T-Mobile and Sprint are making promises about the benefits of their merger that they can’t deliver to consumers anytime soon.