There was the case where the ECF tried to gain FIDE's interest, only to find after a delay that it was thrown back to them as being a domestic issue. In the event, the ECF took no further action, a stance possibly explained by the factors that the likely length of ban had almost expired and that the player concerned had seemingly self-banned by not taking part in any graded chess.
The ECF or arguably its abiters have applied the premise that when a phone is in a bag, that bag doesn't leave the vicinity of the board for peril of the game being defaulted.
What's lacking in current rules, as perhaps illustrated in the Polish case, is a mechanism of warning players who are frequently absent from the playing room that their conduct might be seen as suspicious.