Phone Tracker By Number is a free, full-featured phone locator app that helps you track your family members using their mobile phone number. Developed by Awesome Game Studio for Android devices, this app is perfect for older people who sometimes get lost in the city.

To use the app, you need consent from the person you want to track, and they need to install the app, allow location access, and give you a unique code. Once you have the code, you can add it within the app and track the person's location. The app also has a functionality to know the battery level of the phone.

If you have multiple devices, you can install the app on all of them to locate a lost or stolen phone quickly. The app is completely free, and the developers support themselves through advertisements.

Overall, Phone Tracker By Number is a reliable and easy-to-use app that helps you locate and protect your loved ones.