A multi-channel AI reply stack runs into Twilio’s $120 SMS subscription cost
Cuncirps · reddit · 2026-07-29
The author is building a multi-tenant system for automated AI replies over email, SMS, and outbound voice calls. Their prototype stack is:
- Mailgun for email
- Twilio for SMS
- Vapi.ai for voice calls
- OpenAI as the model layer
They report that email and SMS auto-replies work, but Twilio’s SMS setup requires about $120/month for a number subscription, which becomes a dealbreaker for low-volume days. Vapi works well and can place calls using the Twilio number.
The key question is whether there is a better provider-agnostic architecture, especially one that avoids fixed SMS subscription costs while keeping the system flexible across regions and models.
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