Emergency responders will be able to find T-Mobile E911 callers on Android faster and more accurately thanks to Google’s launch of Emergency Location Service (ELS) with T-Mobile and RapidSOS.

Finding E911 callers has become an increasingly urgent problem for the wireless industry. More than 80% of calls to 911 in some regions now come from wireless phones, not landline phones, and the FCC requires carriers to locate callers to within 50 meters at least 80% of the time by 2021.

Google announced ELS in Android back in 2016, explaining that it offers a faster, more accurate location to emergency communications centers when an Android user makes an E911 call. It uses a combination of GPS, Wi-Fi, mobile networks and sensors for both indoor and outdoor location.