This question is being asked more and more frequently by some of my clients, who've had police officers take their cell phone, make them provide the password, and then search the phone for incriminating evidence or the clients contacts.
In a unanimous decision, the U.S. Supreme Court answered the question and stated that although the police can look at the outside of the phone, they may not search the contents of the phone, including pictures, data and contacts without a warrant.
Therefore, if you're stopped by the police and/or arrested, other than providing your identification and identifying yourself, never answer any questions, without an attorney, or consent to any search, including of your cell phone. Keep your phone locked with a passcode and do not provide it to the police. But never resist arrest, or the taking your phone, or property, since this could result in additional serious charges.
I have over 25 years experience handling criminal matters. If you, a family member or a friend have been arrested, call me for a free consultation. I'll explain the charges and how i can help.
All the Best!
RANDY C. REDEN