The bad news: Last year the festival was at Bicentennial Park, a significantly smaller venue than this year’s Bayfront Park. There was little to no cellphone connection available, probably because I was sandwiched in a mass of 100,000+ people. I can’t speak for the new venue’s cellphone abilities, but with an additional 50,000 people, I’m assuming the same problem will present itself. Your best bet is to set up sporadic meeting spots amongst your friends throughout the day, in case someone in your group gets separated.