Clone or import this project in Android Studio.

• Go to unwiredlabs Location API
• Sign up account and you'll get API key. Keep reference of that API key.

• In root directory of project create file - credentials.properties
• In that file, keep structure as below

OPENCELLID_API_KEY="YOUR_API_KEY_HERE"

Keep your API key here and just sync your project with Gradle files and run this app.

Detailed article on this is available here