Jag, I ignored that post because if you're dumb enough to willingly hand your phone over to a cop, then you deserve to have all of your data taken and used against you.
This applies to you giving your phone to more than just a cop too - there is so much data on a phone that it boggles my mind how open folks are with their phone. You wouldn't hand your wallet over, why would you hand your phone over?
It's a little different if it's not clearly a willing act or if it's part of an arrest. The 4th/5th/6th amendment right(s) to reasonable searches and seizures has been so decimated in the past 20 years anyway, that this is just the next test for the courts.