How to send a message in telegram by phone number?

Question

Programming

How to send a message in telegram by phone number? Is it possible directly to the user or through a bot?

Answer 1

No, you can't) You can only join a group or chat with a user via id.
Moreover, the bot cannot be the first to initiate a chat with the user. First, the user must write to the bot, he will receive the chat ID and only then will he be able to send messages to this chat

Answer 2

https://github.com/antirek/telegram-alert