works on iPhone, Android, BlackBerry and Windows devices to turn your phone into a Walkie Talkie. It is a social radio, much like voice twitter. It can be used to participate or listen in on public conversations, or stay connected with a group of friends. Businesses use Zello to replace 2-way radio or push-to-talk. You can also create a Zello “room” for your company’s customers to visit whenever they have questions.