Setting a reminder that is triggered by a target user device

A mobile device comprising:

• one or more processors;
• memory coupled to the one or more processors and configured to store instructions, which when executed by the one or more processors, causes the one or more processors to perform operations comprising:
• receiving, from a server, a request from another mobile device to enable a notification that is triggered by the mobile device entering or exiting a geofence surrounding a location, the request including data specifying how long the trigger for the notification will remain in effect on the mobile device before it expires;
• determining that a user-selectable permission setting on the mobile device indicates that permission is granted to share a location of the mobile device in response to the notification being triggered;
• and
• in response to the notification being triggered, enabling the trigger for the notification on the mobile device based on the user-selectable permission setting for the notification.

A non-transitory, computer-readable storage medium having stored thereon instructions, which when executed by one or more processors of a mobile device, cause the one or more processors to perform operations comprising:

• receiving, from a server, a request from another device to enable a notification that is triggered by the mobile device entering or exiting a geofence surrounding a location, the request including data specifying how long a trigger for the notification will remain in effect on the mobile device before it expires;
• determining that a user-selectable permission setting on the mobile device indicates that permission is granted to share a location of the mobile device in response to the notification being triggered;
• and
• in response to the notification being triggered, enabling the trigger for the notification on the mobile device based on the user-selectable permission setting for the notification.