Definition
Emergency calling refers to the ability of a device, typically a mobile phone, to contact emergency services such as 911 or 112 without requiring a traditional cellular subscription or even a SIM card. This functionality leverages available wireless networks to establish a connection to the nearest public safety answering point. It is crucial for ensuring user safety and providing a lifeline during critical situations, regardless of the user's service plan. For instance, a lost hiker could use an emergency call feature on their phone to summon help even if they have no cell service. This differs from standard calling which requires an active network connection tied to a specific provider. Emergency calling is a relevant concept in cybersecurity and network security domains, particularly concerning device functionality and user safety.