Turn your phone or tablet into a walkie talkie with this lightning fast free PTT (Push-To-Talk) radio app. Talk to your contacts privately or join public channels to engage in a hot debate. Zello features: • Real-time streaming, high-quality voice • Contacts availability and text status • Public and private channels for up to 6000 users • Option to map hardware PTT (Push-To-Talk) button • Bluetooth headset support (selected phones) • Voice history • Call alert • Images • Push notifications •