Will Zello work without phone or internet service during Irma? What to know about the walkie talkie app | Tampa Bay Times. Zello is a great app for instant communication between people, and works like a walkie-talkie. Just press the button to send and release to receive. However, it won't work without a cell signal or Internet access, so is of minimal utility for normal communications. If you are in a hurricane, and you still have cell or Internet service, you can just call your contact directly. If the hurricane is in the catastrophic category, assume that phone service and Internet service might be out, and Zello is useless. Download it if you want to; but, it isn't going to help you if cell service goes out. Be careful out there.