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SmsLoc

SMS based location query
SmsLoc is an application that queries the location of contacts without the use of mobile network. It uses GPS to retrieve current position and SMS for requests/responses.

SMS request format: `Loc?`
SMS response format: `Loc:LAT,LON,ASL,UTC_S,V_KMH,ACC_M,BAT_PCNT`, where:
- `LAT, LON` are latitude and longitude in degrees rounded up to 4 decimal places.[^1]
- `ASL` or Above Sea Level is the absolute altitude as reported by the GPS in meters
- `UTC_S` is the timestamp of the GPS fix in seconds. The timestamp corresponds to the time of the actual fix, and not when SMS was received.
- `V_KMH` is the speed in kilometers/hour
- `ACC_M` is the accuracy reported by the GPS chip in meters
- `BAT_PCNT` is the battery percentage of the device sending the response

Anti-Features

This app has features you may not like. Learn more!

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Versions

Although APK downloads are available below to give you the choice, you should be aware that by installing that way you will not receive update notifications and it's a less secure way to download. We recommend that you install the F-Droid client and use that.

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  • Version 1.0.2 (102) suggested Added on May 02, 2025

    This version requires Android 11 or newer.

    It is built by F-Droid and guaranteed to correspond to this source tarball.

    Permissions
    • access location in the background
      This app can access location at any time, even while the app is not in use.
    • access approximate location only in the foreground
      This app can get your approximate location from location services while the app is in use. Location services for your device must be turned on for the app to get location.
    • access precise location only in the foreground
      This app can get your precise location from location services while the app is in use. Location services for your device must be turned on for the app to get location. This may increase battery usage.
    • view network connections
      Allows the app to view information about network connections such as which networks exist and are connected.
    • run foreground service
      Allows the app to make use of foreground services.
    • have full network access
      Allows the app to create network sockets and use custom network protocols. The browser and other applications provide means to send data to the internet, so this permission is not required to send data to the internet.
    • read the contents of your shared storage
      Allows the app to read the contents of your shared storage.
    • run at startup
      Allows the app to have itself started as soon as the system has finished booting. This can make it take longer to start the phone and allow the app to slow down the overall phone by always running.
    • receive text messages (SMS)
      Allows the app to receive and process SMS messages. This means the app could monitor or delete messages sent to your device without showing them to you.
    • send and view SMS messages
      Allows the app to send SMS messages. This may result in unexpected charges. Malicious apps may cost you money by sending messages without your confirmation.
    • prevent phone from sleeping
      Allows the app to prevent the phone from going to sleep.
    • modify or delete the contents of your shared storage
      Allows the app to write the contents of your shared storage.

    Download APK 7.3 MiB PGP Signature | Build Log

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