https://www.fide.com/FIDE/handbook/Anti%20Cheating%20Guideli...
11.3.b. During play, a player is forbidden to have a mobile phone and/or other device capable of processing or transmitting chess analysis in the playing venue. If it is evident that a player brought such a device into the playing venue, he shall lose the game. The opponent shall win. The rules of a competition may specify a different, less severe, penalty.