This is a conference that takes place in Barcelona from February 26, 2018 until March 01, 2018. Unfortunately the cheapest pass is €799. It does not appear that they have a student ticket or offer a free pass for volunteering. It seems that various companies offer contests closer to February to win a free pass. Other places online have suggested to check with exhibitors to ask for one of their free passes. This is the list of 2018 exhibitors.
Maybe try this one based out of Paris? This one is also based in Paris.
Based on this MWC survival guide / article, maybe I should look into Women4Tech or Youth Mobile Festival (YoMo).
