Google has transformed the Android operating system into the world’s largest earthquake detection network, leveraging billions of smartphones to provide early warnings before the damaging S-waves of an earthquake reach users. This system detects subtle P-waves using the same sensors that recognize when the phone’s orientation changes, enabling users to take protective actions before the more intense shaking begins. The network, which covers 98 countries and issues around 18 million alerts per month, has recorded over 11,000 real earthquakes between 2021 and 2024. The system provides 15 to 60 seconds of warning, which, while brief, can be crucial for moving to safety or taking protective measures. The effectiveness of this system is highlighted by its low rate of false alarms, with only three incidents across over 1,300 confirmed events. For iPhone users, while Apple hasn’t integrated this feature into its iOS system, the MyShake app offers a similar way to access early alerts through official seismic networks. This advancement marks a significant step in integrating disaster prevention technology into everyday devices, potentially saving lives and reducing the impact of seismic events on communities.