For iOS users: 1. Uninstall the InSightHD app. 2. Select language for you iPhone via Setting. 3. Download and install the InSightHD app from AppStore. 4. Launch the InSightHD app. For Android users: 1. On the device, go to [Settings]. 2. Select [Language & Input]. 3. Change the language. 4. Re-launch the InSightHD app. Note: The steps may vary on different Android devices.