Unhappy Pantec Secret Note A890s - APN is missing MVNO setting

Hi guys,

I'm currently using a Korean branded LTE-A phone - Pantec Secret Note A890s

To get 4g reception with Australia's Virgin Mobile, I must have access to APN > MVNO settings and change it to IMSI. However there is no MVNO setting on this device (it's running Android 4.2.2

Please help!