Unlike WhatsApp, the Telegram messaging app allows its users to set up a public username, so they can interact without having to share their phone number information.
This Telegram privacy feature is useful for those who want to chat with people they just met in a chat group or for any other situation where it is preferable not to reveal the phone number of the account.
The configuration of a username in Telegram is very simple as you can see below.
How to use Telegram without phone number on Android
Open the Telegram app on your mobile device and sign in with your phone number. Touch the Menu icon that appears on the left side of the screen. Then, tap on Settings and select Username.
Enter your new username and tap the confirmation icon located at the top right of the screen.
How to use Telegram without phone number on iOS
If you do it from an iPhone, follow these steps:
Tap the Settings icon located at the bottom of the chat screen. Tap Enter Username and then fill in the Username box with the username of your choice. To confirm the action, tap on the Done option.