alt Hacker NewsOnly new-ish because cell phones are now not only ubiquitous but also contains troves of typically private information. Historically, individuals didn't have their entire lives, financial details, personal details, etc on their bodies when traveling. The border exception to the 4th was used primarily for enforcing customs/trade regulations. That carve out is now used to harass citizens.
Not to blame the victim, but maybe we should not be keeping so much personal information about our lives on a device that is at risk like this. A border patrol agent who gains access to my phone is going to be pretty disappointed to find basically nothing about me on it.