Your missing device must have Life360 installed and logged in in order to be located.
To locate a lost or stolen phone, ask another person in your Circle to open the Life360 app on their phone to update the lost phone’s location. If the app is not logged in, or if the phone is turned off, or if the battery has died, the location will not update. Do not log in to your account on another mobile device or the app will only locate the device you logged in to.
NOTE: Life360 cannot lock or factory reset a device that has been lost or stolen, or emit a sound to locate your device.