I recently joined Telegram for the first time.
Now I have joined a couple of groups which were promoted on Bitcointalk.
I am not sure if admin or members of those groups can see my user name only or if they also can see my mobile number?
Thanks for your help!
unknown users don't have access to your mobile number unless you share it with them.the only user that can view your mobile number are those users that's in your mobile contacts.