Do I need to print my vouchers/confirmation emails out and bring to venue check-in?

In the aim to reduce the use of paper, we would like to discourage you from printing out your vouchers, but rather suggest that you save it to your phone before leaving for the venue. Note we can’t 100% guarantee mobile phone signal at check-in so it is important that you download it and save it to your phone before you leave an area with phone signal.