For the complete documentation index, see llms.txt. This page is also available as Markdown.
SMS Character Limits & Messaging Units
SMS charges are based on messaging units, not just the number of messages sent. These units depend on the type of characters used in your message:
GSM (Standard characters)
Messages up to 160 characters = 1 message unit.
Messages over 160 characters are split into 153-character segments.
Max total: ~1,600 characters (split across multiple units).
Unicode (Special characters like emojis, non-Latin scripts)
Messages up to 70 characters = 1 message unit.
Messages over 70 characters are split into 67-character segments.
Max total: ~737 characters (split across multiple units).
Note:
The number of messaging units is clearly displayed on the UI before launching an SMS campaign, so you can easily review expected charges before sending.
