The product category
Telnyx supplies an API for sending and receiving SMS/MMS. Its documentation explains messaging events and webhook delivery. That makes it relevant to teams building an application, while a business seeking an immediate shared inbox must separately establish its operator interface.
What the published rate means
The US local-number table begins at $0.004 per SMS part plus carrier fees in either direction. Other number types, MMS, number rental and registration have their own charges. The lowest per-part figure is not a complete monthly business texting bill.
Estimate the number of billable parts in realistic traffic. A short reminder, a long model-generated answer and an attachment do not necessarily have the same billing unit.
The shortlist test
The webhook guide documents identifiers, signatures, retries and failover configuration. Ask the engineer responsible for the integration to turn those into a small acceptance checklist, including an interrupted endpoint and a repeated event.
Choose this category when carrier messaging serves the customer journey and your team is willing to own the workflow around the API. Keep it alongside other SMS alternatives when comparing it with managed iMessage lines, so a category difference does not become a misleading feature score.