The NBN service can come in either of three modes. A direct-to-your-premises connection(FTTP), a direct-to-your-MDF connection (FTTB) or a direct-to-a-node on the street(FTTN). The condition of the copper line in the FTTB and the FTTN modes might have a bearing on speed. After you cross your 250 GB included data, speed will be lower but no extra charges apply. If you want a modem, the iiNet TG789 can be purchased for $89 and $10 delivery charge. The cost of the modem is waived on the 24-month contract.