I can't stand the fact that iOS will download updates without asking... even when not connected to a charger. I've been on terrible train station wifi in a fore

I can't stand the fact that iOS will download updates without asking... even when not connected to a charger. I've been on terrible train station wifi in a foreign land and noticed that an update "is now available!" Absolutely horrific decision from Apple on that one. The only way to stop it? Filling your phone with enough music/video/pictures that iOS can't fit the update in there...