Write an article based on this "Open Telegram on your Android. Tap the magnifying glass. Type the contact’s username. Tap the person you want to contact. Tap ⁝. Tap Share my contact."
It’s the blue icon with a white paper airplane inside. You'll usually find it in the app drawer. It’s at the top-right corner of Telegram. A list of matching search results will appear. This opens a conversation. It’s at the top-right corner of the conversation. This sends your phone number to the selected contact so they can add you to their address book. At that point, you’ll be added to each other's contact lists.