Error Codes

Code	Description
1	Phone number is opted out.
2	Forbidden words.	List Forbidden Words » Forbidden Words & Phrases »
3	Empty MMS resource.
4	Unprocessable entity.
5	Not enough credits.
6	API App is NOT activated.
7	Invalid IP address.
8	SMS Sending Failed - limitation has been reach: SMS with same content can be sent 1 time every 10 seconds.
301	Sender Long Code is temporarily blocked.
302	Sender Long Code is permanently blocked.
1000	Phone number is opted out globally.
1001	Phone number is blocked globally.
> 10000	Content blocked by carriers or rejected without details provided.

Example Error Response Headers:

Status Code: 422 Data Validation Failed.
Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Connection: Keep-Alive
Content-Length: 171
Content-Type: application/xml; charset=UTF-8
Date: Tue, 29 Aug 2017 13:16:26 GMT
Expires: Thu, 19 Nov 2017 08:52:00 GMT
Keep-Alive: timeout=15, max=100
Pragma: no-cache
Server: nginx (CentOS)
X-Powered-By: PHP/5.6.16
X-Rate-Limit-Limit: 1000
X-Rate-Limit-Remaining: 999
X-Rate-Limit-Reset: 0

{
    	"name":"Unprocessable entity",
        "message": "Phone number is opted out.",
        "code":1,
        "status":422
}

<response>
    <name>Unprocessable entity</name>
    <message>Phone number is opted out.</message>
    <code>1</code>
    <status>422</status>
</response>