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For customers experiencing any issues with their NBN service, we recommend the best thing to do first is check if there's an outage on the NBN network.
We have created this article that can guide you on How to Check for NBN Network Outage
If you are not affected by an outage, you may check the articles that we've created to troubleshoot your connection speed issues.
If you are using a WiFi connection, then check these articles: