How it works: After installing an extension, such as Jarvis Reach or Prospeo, it places a button on LinkedIn profiles. The tool scrapes the profile when you click it and compares it to their own database to display the verified phone number and email address. Most of these devices employ real-time checking of the line so that you see it only when the line is active. https://jarvisreach.io/blog/find-phone-number-for-free/