Poor security. I'm not receiving activation SMS, and have come to realize that my new Number is in use by another telegram user. Forcing to bind to a phone number has potential for accounts to be accessed by other people, due to the use of texting apps to counter privacy invasion. While we're here, Telegram talks a lot about encryption, but it doesn't actually have any in rooms and regular conversations, while bots and custom gifs (read: Spyware) log conversations and send those outside.