What is Twilio Error 30008?

Error 30008 is the Twilio error for an unknown delivery failure. A carrier or downstream provider said the message failed, but did not say why.

Common causes

• The phone was off or could not receive SMS when the message arrived.
• The phone was roaming or off its network.
• A problem with one carrier path or one type of phone.
• The network did not accept the sender, for example an alphanumeric sender ID.
• The length or the characters of the message.

How to fix it

1. Check the delivery events and the status in the message logs.
2. Send test messages to other numbers on the same carrier. If they arrive, the problem is with the recipient's phone.
3. Send the message again, shorter and with simple characters.
4. If it continues, contact Twilio Support with 3 or more Message SIDs from the last 48 hours that returned 30008.