E12001 — SMSBodyTooLong
The message text is too long. An SMS is limited to 12 segments; shorten the text or split it across multiple messages.
- HTTP status: 422
- Type: validation_error
- Name: SMSBodyTooLong
What to do
Shorten the message text, or split it across multiple sends, so each message stays within the 12-segment limit, then send again.
Related
- E12xxx — SMS sending & delivery: every code in this range
- Errors: the full wire contract, status mapping, and error catalog
- Error handling: branching on type and code, validation details, and vendor_code