No, the police must get a warrant if you do not give them your permission.
According to the U.S. Supreme Court, a cell phone cannot be searched incident to arrest. Chief Justice John Roberts declared that police must get a warrant before searching a cell phone. A writ of certiorari was granted in two cases involving defendants who were convicted based on evidence found on cell phones. The two cases were United States v. Wurie and Riley v. California.
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