A free program for Android, by Find My Device Apps.
With Find My Phone Whistle: Whistle to Find My Device, you can locate your phone in a matter of seconds. If you have lost it, you can simply whistle twice to get the device’s location.
How to use this app?
1. Download and install the app.
2. Open it, and you will be guided step-by-step through the process.
3. After finishing the installation process, it will be ready for use.
4. You are now able to use the app. You can open it, and you will be greeted with the main interface.
5. On the main interface, you will be able to choose the type of phone you have.
6. After finishing the installation process, you will be able to use it.