Using an 3rd-Party App Download a 3rd party app from the Google Play Store or Apple App Store. Open the app and sign up. Generate a phone number. Select your number. Copy your new phone number. Download and open WhatsApp. Paste your new number into WhatsApp when prompted. Wait for your verification code.
Use Reverse Phone Number Lookup Some popular WhatsApp number trackers include Information, TrueCaller, US Search, Spy Dialer (only U.S.-based numbers), and TruthFinder.