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I should also preface that there is a $25 fee for unlocking the device. I would recommend having your payment card ready as well as the IMEI number to move forward with the unlocking.
Once you've completed the process for unlocking your device, it can take up to 7 business days to receive the unlock code. Should you have any issues after this time frame, we recommend having a chat to our 24/7 Messenger team over the Optus App whom will be able to advise further and walk you through this process