: Uses Bluetooth to create a mesh network that works at concerts, sports events, or during emergencies. While primarily for messaging, it can reach recipients over large distances by "hopping" through other users' phones.
: Features a "call routing" option that uses your wireless provider's voice minutes instead of Wi-Fi or data, which is useful in areas with poor internet coverage. Calling Apps For Android Without Wifi
: A highly secure, Android-only app that enables communication between devices without internet, cellular networks, or cell towers. It is ideal for secure, short-range syncing. : Uses Bluetooth to create a mesh network