When sending broadcast messages (particularly marketing) it's imperative to include an unsubscribe/opt-out option.
If your contact list is managed using the TNZ Address Book, this is easy!
1. Log into the Dashboard and select Send SMS from the menu
2. Ensure you include an opt out option in the text message, for example: Reply STOP to unsubscribe
3. When selecting your contact list, use the Recipients or Groups option to select mobile numbers from your TNZ Address Book
4. Send your broadcast!
5. Periodically, check the SMS Received menu for any replies received. Should you see a STOP or equivalent reply, check the box next to these messages and click the Remove from Address Book button