A player is forbidden to have any electronic device not specifically approved in the playing venue (Art. 11.3.2); If it is evident that a player has such a device on their person in the playing venue, that player loses the game (Art. 11.3.2.2)
Why people argue about this
People often assume that simply having an electronic device nearby is enough to trigger a penalty under Art. 11.3.2, forgetting that it must be on their person in clear view during play for them to lose the game outright. They overlook the crucial detail about it being visible and used improperly.