The Telegram Phone Checker is a Python script that checks Telegram accounts using phone numbers or usernames. It features the ability to check single or multiple phone numbers and usernames, import numbers from a text file, and auto-download profile pictures. The script saves results as JSON files and provides detailed user information. It also has secure credential storage and allows users to clear saved credentials. To install the script, users need to clone the repository and install required packages using pip. The required packages are telethon, rich, click, and python-dotenv. Before running the script, users need to set up Telegram API credentials, their phone number, and a verification code. The script can be run from the command line and offers six options, including checking phone numbers or usernames from input or file, clearing saved credentials, and exiting. The results are saved in a results folder as JSON files and a profile_photos folder with downloaded profile pictures. The tool is for educational purposes only and users should respect Telegram's terms of service and user privacy.