I recently attended a tourney in which at the beginning of each and every round the TD made an announcement to everyone to turn off their cell phones and that a ringing cell phone could cause someone to receive punishment as harsh as game forfeiture . In every round ( all 5 ! ) someone's cell phone rang anyway and noone received punishment of any kind ! Why ? This was the only " black mark " against this tourney imo and other than this it was a well run event that I enjoyed very much . I have yet to see anyone punished for ringing cell phones and think FIDE's approach is best : game forfeiture ! Perhaps then people would turn off their cell phones ? !
This is unusual, but it depends on the tournament director.
I have yet to (and will not probably not) read all the six pages of the discussion, but it has probably been answered somewhere there.
Diakonia who obsessed with cheating in this thread now has their account closed. In my experience those who obsess with cheating in Chess usually rationalize cheating themselves believing all their opponents do.
https://www.chess.com/member/diakonia
I highly suspect that the user "opened and closed" his own account of his own accord several times.
But I won't discuss beyond that.