@kazani: Oksigenia SOS, autonomous bio-telemetry rescue system using SMS

Oksigenia SOS is an open-source safety app that detects severe falls or prolonged unconsciousness and automatically triggers a rescue protocol by SMS, without internet access, servers, or accounts. The article states that the system works over GSM/SMS on 2G, 3G, 4G, and 5G networks and that user data never leaves the phone. It is distributed through GitHub, IzzyOnDroid (apt.izzysoft.de), and the Oksigenia Labs website.