Use of an electronic device whilst game in progress

[Tim Spanton]

8.1 In the course of play each player is required to record his own moves and those of his opponent in the correct manner, move after move, as clearly and legibily as possible, in the algebraic notation (See Appendix C), on the scoresheet prescribed for the competition.

There is no penality prescribed for not recording, but it's clear cheating.

Well, it's fouling. I wouldn't call it cheating unless the aim is to get an unfair advantage.

At the very least it must have been distracting