content: That is true and it is also a thing I feel annoying. But if you think about it Telegram is born as a replacement for SMSes... and you can send them to all your contacts on the phone. Most likely, if you have a contact in your phone, they also have your contact in theirs. So I believe that the reasoning here is that if you have someone in your contacts you do so because you want to be able to contact them (and be contacted by them). Anyways I too wish it had an "invisible mode" and the chance to select who is allowed to contact me on Telegram. Perhaps there is a way to suggest this to the Telegram team. I just didn't bother to look at it.