Trap Phone Through TSA

So I bought a trap phone in Florida while staying with my dad bc I was tired of him taking my phone whenever he wanted. I’ll be going back to my mom’s house In Illinois in like 3 weeks. My problem is that my dad comes with me and my brother thru TSA and we separate when we have to enter the plane. So Im just wondering, how do i get my trap phone thru TSA without my father seeing/noticing it. Please help💔