How to get user_id of a phone number in telegram : <p>Im creating a bot to send message to multiple contact in Telegram.
user can share contact with bot. then i use getUpdates and obtain the phone number. 
For using the sendMessage Method i need the chat_id. 
now how to get chat_id of a user with his phone number?
Is there any way better than this method to do this?</p>
