[gdo]

Text messaging was a very common things I've seen at the internationals. My team has always had decent cell reception at the Georgia Dome, but don't always think you will have cell reception.

Something I saw also was Wireless cards from Verizon and other cell providers to do IM between teams, but this was more common from FRC teams.

Something else that works is to have 1 guy near the edge of the field so that they can pass sheets of data or a thumb drive to another member on the team on their way back to the pits.

I've seen all three systems, we've normally done the 1st and 3rd systems with varrying success. You will have to find the right system for yourself, but often passing paper or a flashdrive to your team as they walk by is one of the best ways we've found over the years if you don't get the cell reception.