ColorShout app for iPhone and iPad

Cheer for your favorite football team by showing your colors.
Raise your phone up and display your team colors proudly!
Becoming a football fan has just become an interactive experience. You can use this app to show your team’s colors proudly. The app also displays how many other people are displaying their colors, too. Posters and signs have become a thing of the past … use this app to take cheering for your team to a whole new level!

When on a team screen, you can press the "bluetooth" button to enter "cheer" mode. If other shouters around you press the "ear" button, then they go into "listen" mode and you will be able to control their shouting.