This page lists the error codes that can be returned by the webservice, click the error code for more information and potential solutions to common issues
HTTP Error code403
DescriptionThe mobile phone with number "to" has previously sent an opt-out message to stop further messages from your "from" number. It's not since then sent an opt-in message, so your message could not be sent.
RemedyPlease stop sending such messages to this mobile phone.
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