The players talk about weird things? That's probably what you heard. It is not a plausible excuse to say that he made the mistakes because of the cellphone. It happened during the top 8 and you're telling me that it's not important, Andrew used the cards that he was allowed to return in the deck to beat Jo and won the first match. When a player makes a mistake during such events, that's just too bad, there's no reason to accuse the other player of our own mistakes.
For example, if player A plays Uxie from SF when there is an Mesprit SF played during it's opponent's turn, the player A cannot take back Uxie because he forgot.
If I was able to scroll over my deck, and see what's in there, I can then choose whatever I want in my advantage. It is not a minor error, it changes everything since cards we're drawed with Cosmic Power and there is more chance for the player to get what he then needs to complete the strategy in his hand.
In other words, the judging was really soft on this and did not consider the whole situation, took a quick resolution and took a bad decision that cost a player one game out of three.
Andrew, the name is David Huynh from Montreal. If you could please report all the actions and what you said back then to clarify this