I would like to set up a mobile application to send SMS messages to nearby contacts. To make it simple, here are the steps in the process:
- The user opens the app and adds a point on the map.
- A script automatically returns the list of contacts within a radius of 10 km around the point.
- The user's smartphone sends an SMS (via SIM card) to each contact found.
The nomadic user may sometimes be out of reach of the 3G/4G network, so the data (rasters, location and number of contacts...) will have to be stored in the smartphone memory.
Which technology do you think should be used for offline use?