Detecting falls using a mobile device

A wearable electronic device comprising:

• one or more motion sensors configured to be physically coupled to a user;
• one or more processors;
• and
• one or more non-transitory computer readable media storing instructions that, when executed by the one or more processors, cause the one or more processors to perform operations comprising:
• obtaining motion data indicating a motion measured by the one or more motion sensors;
• determining that the user has fallen based on the motion data;
• determining, based on the motion data, that the user has moved within a first time period after the user has fallen;
• determining, based on the motion data, that the user has not moved within a second time period after the first time period;
• and
• responsive to determining that the user has fallen, that the user has moved within the first time period, and that the user has not moved within the second time period, generating one or more notifications indicating that the user has fallen.