Troubleshooting
Official telegram.org Source
For security reasons, login codes dictated via a phone call are only available for accounts that havetwo-step verificationenabled (Settings > Privacy & Security > Two-Step Verification).
Please also note that Telegram accounts can only be connected to a mobile number. We currently don't support landline numbers.
Official Telegram Reference: https://telegram.org/faq
Part of the TGWAY.com Official Telegram Knowledge Base (98 Verified Q&As).