Would be interested to see how the current SC would decide this, it could really go either way but I feel like Roberts, ACB and Gorsuch lean a bit more to the privacy side. Having unbridled access to our phones just because we come home is extremely problematic, it has all of our passwords, our financial records, in some cases the controls for our security systems, cameras inside our home, our door locks, our 2FA, not to mention many of us work in professions with sensitive information, I have work emails that are legal documents and ongoing investigation products, correspondence with the lawyers I work with that are under privilege etc. If they can make you sign into your phone can they make you sign into any other applications? Would deleting applications before you go through customs make you open to prosecution for deleting something they may want to search? And without a warrant there is less oversight meaning border agents have even more ability to break the law with your information.