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Hi @mitsy01, sorry to hear about your NBN modem order issue. Since the new modem has a 4G back up service it runs on our mobile 4G network. This is the reason you have received the sim card. This also means you should be getting the new modem. You can`t use the sim card with the old modem.
We will need to loo into the order for you. In saying that since this is a public forum we can`t access customers account details here. As such your best to contact us via Social media by sending a → private message to Optus on Facebook or a → direct message on Twitter with the details for further assistance.