Earlier quoted context omitted.
Border Patrol can wait longer than you want to wait at the airport, you should not bring your personal phone if you don't want them going through all the contents, they can hold your device for an inconvenient amount of time if you are an American citizen. If you say no and are not an American citizen you can be denied entry at the airport and sent home.
> you should not bring your personal phone if you don't want them going through all the contents isn't the right move here: wipe your phone, travel to destination, then restore from cloud backup? in the middle, you can let them inspect your wiped phone.
Wipe it, let them inspect it, sell it, and buy a new one.