The 7 States police need a warrant to search a cell phone
According to Forbes, in New Hampshire and 5 other states police need a warrant to search your cellular phone. New Jersey isn’t blue on the map but on July 18th a court ruled that a warrant is needed.
United States Court of Appeals for the First Circuit ruling relating to Maine, Massachusetts, New Hampshire, Puerto Rico and Rhode Island. http://blogs.findlaw.com/first_circuit/2013/05/police-cell-phone-search-not-allowed-with-warrant.html
New Jersey Supreme Court ruling. http://jolt.law.harvard.edu/digest/privacy/new-jersey-supreme-court-police-must-obtain-warrant-before-accessing-cell-phone-location-information
Florida Supreme Court ruling. http://www.abajournal.com/news/article/cops_cant_search_cellphone_seized_during_arrest_florida_supreme_court_says_/
Ohio Supreme Court ruling. http://www.opd.ohio.gov/Legal/Lg_CellPhone.htm