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Location alarm app

Both Tasker and Automateit can determine what cell towers you are on and can perform actions as you dictate based on detecting those towers.

In Automateit I selected:
- "Cell ID Trigger" and then walked the perimeter of my home and detected the two to three possible cell towers I could be connected to
- then the action was to turn on wifi when one of those towers was detected. (in your case the action could be "Play Sound Action")

Automateit has both free and paid versions if you want to try it out. Tasker is only paid.
 
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