This one hits hard for Farsi speakers. Telegram is basically the public square for Iranians, and in Iran every SIM card is registered to a national ID, so the phone number behind an account is exactly the part people can't hide.
Worth repeating: normal Telegram chats aren't end-to-end encrypted (only "secret chats" are). Keep Telegram for public channels, and use Signal (with a proxy where it's blocked) or SimpleX for anything sensitive.
