I think this is great news for a change. I don't think they should be able to search your phone without a warrant. There is too much personal information on phones anymore. If cops have a good reason to search your phone they can get a warrant pretty fast. Unless a judge doesn't think there is good reason to search your phone.Police may not generally search the cellphones of people they arrest without first getting search warrants, the Supreme Court unanimously ruled Wednesday.
Supreme Court limits cellphone searches after arrests - CBS News
The Obama administration isn't too happy about it though. They like those warrantless searches.