E: but seriously, what happens to non citizens. What happens if you bring a burner/wiped phone? I assume digit forensics can confirm it was pre wiped but what's topping them from alleged you wiped on US soil.
My fondest border experience was many years ago when entering France; this was before the UK had joined the EU. (Our later exit was dumb, IMO.)
Anyhow, a youngish officer - probably mid-20s or so - examined my passport while asking questions, in perfect English. His voice was even and his demeanour calm and professional. Then he took a step back, closed my passport and put it in his pocket. A few seconds later, he started laughing and said: "The look on your face. Priceless. Welcome to Paris."
He really had me and I saluted him for that.