The TelMe app will not function if the allow mock locations / developer mode setting is enabled on your device.
If you see the Android Error Message: "This function is not supported when mock locations are turned on. Please refer to your devices documentation to disable this setting.
To ensure correct functionality developer mode needs to be completely revoked.
(We are aware of an issue effecting some Samsung devices where this setting, once enabled, cannot be disabled completely. Users will need to contact their device supplier for assistance with this issue. Like most apps we cannot support any device nor assure correct functionality for devices operating in developer mode)
Mock location call rejection
Android Mock Location Settings