A mobile device, comprising: a speaker; and one or more processors in communication with one or more memories, the one or more processors configured to execute computer-executable instructions stored on the one or more memories to at least: determine whether a user has responded to a user interface prompt displayed in response to detection of a physical event associated with the user; in accordance with a determination that the user has not responded to the user interface prompt after expiration of a time period, transmit a communication channel request to an emergency response service; at least in response to the emergency response service accepting the communication channel request, transmit an audio message to the emergency response service; characterized in that the one or more processors are configured to execute computer-executable instructions stored on the one or more memories to at least: output, via the speaker, a first loop of the audio message at a first volume level; and output, via the speaker, a second loop of the audio message at a second volume level that is reduced compared to the first volume level. a speaker; and one or more processors in communication with one or more memories, the one or more processors configured to execute computer-executable instructions stored on the one or more memories to at least: determine whether a user has responded to a user interface prompt displayed in response to detection of a physical event associated with the user; in accordance with a determination that the user has not responded to the user interface prompt after expiration of a time period, transmit a communication channel request to an emergency response service; at least in response to the emergency response service accepting the communication channel request, transmit an audio message to the emergency response service; characterized in that the one or more processors are configured to execute computer-executable instructions stored on the one or more memories to at least: output, via the speaker, a first loop of the audio message at a first volume level; and output, via the speaker, a second loop of the audio message at a second volume level that is reduced compared to the first volume level. determine whether a user has responded to a user interface prompt displayed in response to detection of a physical event associated with the user; in accordance with a determination that the user has not responded to the user interface prompt after expiration of a time period, transmit a communication channel request to an emergency response service; at least in response to the emergency response service accepting the communication channel request, transmit an audio message to the emergency response service; characterized in that the one or more processors are configured to execute computer-executable instructions stored on the one or more memories to at least: output, via the speaker, a first loop of the audio message at a first volume level; and output, via the speaker, a second loop of the audio message at a second volume level that is reduced compared to the first volume level. output, via the speaker, a first loop of the audio message at a first volume level; and output, via the speaker, a second loop of the audio message at a second volume level that is reduced compared to the first volume level.