You can find more information on Telegram 2-Step Verification in this post:
https://telegra.ph/Can-someone-break-Telegram-2-Step-Verification-06-13
https://telegra.ph/Can-someone-break-Telegram-2-Step-Verification-06-13
Telegraph
Can someone break Telegram 2-Step Verification?
If anyone tells you they can break into Telegram accounts protected with Two-Step Verification, ask them to replace the GIF in this channel: The account that controls this channel has Two-Step Verification enabled, but whoever can "break" it shouldn't have…