The channel decision comes first
Twilio lists SMS, MMS, RCS and other supported messaging channels. If the requirement is an API-driven text conversation rather than specifically an iMessage identity, it belongs in the comparison. Keep that scope visible when assessing it beside providers selling blue-bubble messaging.
Useful event documentation, real integration work
The status-callback guide describes changes in an outbound message’s lifecycle, including channel-dependent read events. It recommends SDK signature validation and allowing for evolving callback parameters. Build against the documented channel and callback format; do not assume another vendor’s JSON handler is interchangeable.
For an agent, transport status and customer intent need separate records. A delivery event should not be interpreted as approval of a booking, purchase or change requested by the model.
Budget the usage and the operating layer
The US pricing page lists long-code SMS at $0.0083 per segment in either direction, before additional carrier fees and other applicable charges. Include the number, registration, media traffic and application operations in your estimate.
Twilio is a credible alternative when carrier messaging is acceptable and your team owns the application. Validate the human handoff, repeated callback handling and cost of the intended workload before calling the agent ready.