Being public on Telegram means you have set a username. Once this is set up other users who are not known to you can search for you and make contact with you. They cannot see your number however. There is also an optional ‘Find People Nearby’ feature that is turned off by default. This can be manually turned on and it will alert anyone in the surrounding close area on Telegram that you are nearby.
We recommend Internet Matters for further information about Telegram Messenger. Access free
parental control how-to guides to get up to speed on how to set the right level of
protection to give them a fun and safe experience.