GPS-Based Mobile Numbers Retrieval Solution

I need a GPS-based solution to get all mobile numbers present at a location at a given point of time. For example, I need to get all people's mobile numbers who were present(with their mobile phones) at a town hall on 16-Aug-2025 between 11:00 am to 11:15 am IST.

Requirements:
- Do comply with all the legal requirements
- Choose a location on Google Maps
- Select a duration using date and time picker
- Retrieve mobile numbers using GPS data, mobile network provider data, WiFi data and Bluetooth data

Ideal Skills and Experience:
- Experience with Google Maps API
- Familiarity with mobile network, WiFi and Bluetooth data integration
- Proficient in creating user-friendly date and time pickers
- Previous experience in similar projects is a plus

Please provide as many demonstrations as possible to meet my requirements.