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Hi @Terry1, sorry to hear you're having some troubles with your mobile broadband SIM after you changed plans.
May I suggest having a look at My Optus Service Is Not Working: Troubleshooting Index for steps to help you get the best connectivity for your service. Just select the Internet connection type you have.
Please also check Mobile APNs & technical settings to ensure your APN settings are correct.
If you're still having issues with connecting please reach out to us by a private message via our Social Media pages (official Optus Facebook page or Twitter page) where we'll be able to grab your details securely and take a closer look for you. From there, we'll be able check the status of your service and possible causes for it not working.
Alternatively, you can reach us on a smart device via our Messaging service on the My Optus app 24/7.