Apport!

Apport is a walkie-talkie voice communication, and photo and video sharing app that works without an Internet connection or cellular phone coverage. You can use Apport to chat, or send photos and videos to friends over WiFi and Bluetooth. Apport uses Bluetooth and / or WiFi to transmit photos, videos, and voice messages between devices that are located within 200 feet of one another In order to communicate Apport must be installed on every participating device