If your address is tagged as a new development by nbn, you will need to pay $300 for the installation or activation. With 10mates you can choose to pay that upfront or pay it off each month. On a 12 month contract you would pay an additional $30 per month, on a 24 month contract you would pay an additional $15 per month. Obviously if you were to cancel the contract you would still need to pay the remaining new development fee plus any other charges that apply.