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Hi @JocelynM_7, we are aware of an issue impacting 4G based calls on some Optus mobile services (ref 23367369). We're working to restore services as soon as possible.
In the meantime, we recommend switching to the 3G network or enabling WiFi Calling on your device if possible. Data services are not affected so you can continue to make calls through apps such as Facetime or Whatsapp.
Customers can also view updates on our Network Status page here: https://www.optus.com.au/about/network/service-status. We apologise for any inconvenience caused during this time.
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