Репост из: Dagmawi Bedilu
Look out for the new scam on Telegram where you'll receive a friendly chat message from a friend, a group/channel you follow that tells you about a newfound website that gives a new opportunity for a job or money... (ex. freelance work.co). Which will take you to a website that will ask for your phone number and asks you to put in a code that is sent to you on Telegram. DO NOT put in that code because that's a code telegram uses to identify you as you and once you give that code your telegram is hacked (the system/hacker will have access to your telegram account) and also using your account will send a similar message to all you friends and groups you manage. If you have already made the mistake of sending out your code... then you can do the following to terminate all other sessions.
Go to Telegram Settings > Privacy and Security > Active Sessions > Terminate all other sessions
P.S - Telegram Rule to Live By - Never give you telegram access code to anyone/anything except telegram itself.