Samsung Galaxy XCover Pro
Motorola Moto E6
Samsung Galaxy J2 Core
Nokia 1.3
Motorola Moto E6s
Samsung Galaxy XCover 5
An easier way is just to drop it into an RF bag....
Another way is to use a phone with a "bad" battery and use external power brick that attaches to the USB style port.
Pull the "sim" card - while not all phones have hard sim cards installed, it might help keep the phone offline if it is powered up. However; the cell might still ping cell towers.