30009: Missing inbound segment

This error occurs when not every segment of a multi-part inbound message is received. Long SMS messages are sent as multiple segments, and inbound Message records expose the total segment count in num_segments.

• The mobile network or carrier didn't successfully send the entire message to Twilio.
• The sender's handset didn't successfully send all segments.
• The sender was in poor network coverage, which caused an incomplete message to be sent.

• Ask the sender to try sending the message again from an area with stronger network coverage.
• If the sender is sending a long SMS, ask them to shorten the message or send it as multiple separate messages. SMS messages longer than a single segment are concatenated into multiple segments, so reducing the number of segments can reduce the chance that one segment is missed.
• If this issue occurs repeatedly for multiple users, collect the affected Message SIDs and contact Support for investigation.

• Receive and Reply to Incoming Messages
• Message resource
• How long can a message be?