I don’t plan on handing my phone over to a cop.
I watched a trial awhile ago - deadly car wreck. In the interview room right afterwards the young man was so anxious to get his phone back that he offered it up to the cop so he could prove that he wasn’t texting.
“Well - we’ll just get a warrant, but that will take longer. If you just give us the phone now you’ll have it back real quick.” (It was still several weeks before he got his phone back - the cop made it sound like it would only take a few hours.)
Anyway - because he volunteered the phone, EVERYTHING on his phone could be looked through - not just his texting history at the time of the accident. While he had not been texting, there were messages with his drug dealer which he got in trouble for. (He was found not guilty of the car wreck - the other person had drifted into his lane as shown by forensics.)