← Error codes

SMS_VENDOR_UNSUPPORTED_OP

HTTP 400No

Selected SMS vendor does not support this operation (e.g. lookup on a China vendor); pin a capable vendor or omit.

By default a failed call returns a result with an error instead of throwing, so your business flow is never interrupted.

Published error codes are permanent: their meaning never silently changes, and deprecated codes keep returning for at least 12 months.

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