1. Visit spintel.net.au
2. Login to My Account by selecting Customers and then My Account
3. Select the mobile service (from the list on the dashboard if you have more than one) and click on Manage Service.
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4. Scroll down to Service Management and click Change service settings
5. Scroll down to Configure Settings, then switch ON/OFF the feature you want to enable or disable.
5. Click 'Update Settings' to submit the changes.
Note: Activation will take effect within 15 minutes to four working hours