A premium SMS Shortcode can either be MO or MT. 

MO: Mobile originator- in this case the end user is billed when they send a message to the short code.

MT: Mobile Terminator- in this case the end user is billed when they receive a message from the short code. 

For further clarification send an email to info@africastalking.com or smsussd@africastalking.com.

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