This tutorial describes how to implement a simple phone verification system using PHP, MySQL, and jQuery. The system allows users to enter their phone number on a web page, generates a random verification code, initiates a call to the user's phone, and prompts them to enter the code. Once the correct code is entered, the database is updated with the verified status. The system also includes features such as error handling, polling for status updates, and displaying success messages to the user. The tutorial provides sample code and instructions on how to set up the system on a server, making it a useful resource for developers looking to implement phone verification in their applications.