After entering your phone number, an authentication code will be sent to you through Telegram that you will then enter in the browser. Source: Chris Wedel/Android Central Once you have verified your account, you'll see three options on your Telegram Core page, select Delete Account. Source: Chris Wedel/Android Central The next page will provide some information to ensure you know what you're getting into when you delete your page. If you are sure you want to proceed, and the phone number matches the account you wish to delete, select Delete My Account. Now that you have deleted your account, all of the messages, chats, and contacts you had within the Telegram account will be removed entirely. Should you sign up at a later date using the same phone number, nothing from the previous account will be available — that includes contacts.