Telegram gateway

Telegram Gateway delivers high-deliverability SMS verification codes to global users for a flat rate of $0.01 per message.

Telegram Gateway leverages a massive 900 million user base to bypass traditional carrier markups and routing failures. If a user has a Telegram account, the service delivers the verification code directly via the app for $0.01; if they are not on the platform, the system remains free of charge (no delivery, no fee). This setup eliminates the fluctuating costs associated with regional SMS aggregators and ensures instant delivery through the same encrypted infrastructure used by Telegram's core messaging service.

https://gateway.telegram.org