SMS Segments Explained for ChronosCodex

What an SMS segment is, why long messages can count as multiple segments, and how SMS compliance affects sending.

What is an SMS segment?

SMS is counted by billable segment, not by visible message bubble. Long messages may count as multiple segments. Special characters can affect segment count.

Plan limits

Compliance

Consent and opt-out rules apply. SMS availability may require setup, number assignment, wallet readiness, and 10DLC/compliance approval.