Yes, as far as you are confident of the compatibility and configuration of your modem with your available internet technology (i.e. NBN FTTB/N FTTP HFC or ADSL) you can use it. Please note that we do not take any responsibility of the BYO hardware and it is completely up to the agreement of terms and conditions between you and the vendor of the modem you are using. 

If you still have any confusion, please give a call to our friendly support team and we will be happy to help you out.