Zello is about voice communication without calls, instant messaging without typing. That is that Zello does voice communication uses less bandwidth than phone, just like a text. So instant two way communication works when cell phones may not. Group communication with Zello is just as easy — everybody participates at his own pace and the entire group stays tuned, without interrupting their normal activity. Public safety services use this method for ages and there is a good reason for that. It simply works. Zello is based on p2p-architecture, which allows scaling easily, and proprietary protocols optimized for real-time communication over low-bandwidth and high-latency connections such as GPRS or EDGE  Links www.emweekly.com www.titanhst.com www.zello.com Linked In: https://www.linkedin.com/company/2478568/ Twitter: @zello http://blog.basecampconnect.com/english/3-emergency-managers-you-should-follow-on-linkedin-part-2