Proximity fence

A mobile device comprising:

• one or more processors;
• and
• a non-transitory storage device storing instructions operable to cause the one or more processors to perform operations comprising:
• receiving an application program, the application program being associated with an identifier of a signal source group that includes a plurality of signal sources, the signal source group defining a multi-level proximity fence comprising a high-level proximity fence and a low-level proximity fence, the low-level proximity fence being enclosed in the high-level proximity fence, wherein the application program is configured to activate upon entering the multi-level proximity fence;
• detecting a signal source identifier from a signal source, the detected signal source identifier comprising a first-level identifier and a second-level identifier;
• upon determining that the first-level identifier in the detected signal source identifier matches the identifier of the signal source group, activating a first function of the application program;
• and
• upon determining that the second-level identifier matches at least a portion of an identifier of an individual signal source in the signal source group:
• determining that a distance between the mobile device and the individual signal source satisfies a proximity threshold;
• and then
• switching the first function of the application program into a second function of the application program, the second function being different from the first function.

A non-transitory storage device storing computer instructions operable to cause one or more processors to perform operations comprising:

• receiving, by a mobile device, an application program, the application program being associated with an identifier of a signal source group that includes a plurality of signal sources, the signal source group defining a multi-level proximity fence comprising a high-level proximity fence and a low-level proximity fence, the low-level proximity fence being enclosed in the high-level proximity fence, wherein the application program is configured to activate upon entering the multi-level proximity fence;
• detecting, by the mobile device, a signal source identifier from a signal source, the detected signal source identifier comprising a first-level identifier and a second-level identifier;
• upon determining that the first-level identifier in the detected signal source identifier matches the identifier of the signal source group, activating a first function of the application program;
• and
• upon determining that the second-level identifier matches at least a portion of an identifier of an individual signal source in the signal source group:
• determining that a distance between the mobile device and the individual signal source satisfies a proximity threshold;
• and then
• switching the first function of the application program into a second function of the application program, the second function being different from the first function.