What error will be received if a Number is blocked for Short Code traffic?

There are some operators in US that are blocking by default the reception of SMSs from Short Codes on pre-pay numbers, to prevent the receiving number to incur in Premium charges. The error that will be received when messages are blocked due to this limitation is:

Error code 6 (Anti-Spam Rejection/Content Blocking)

The End User would need to contact the Carrier to specifically request the blocking to be lifted for his number.

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