Do I need to get a landline connected to get internet on?
Yes. ADSL2+ data service is served through your landline and you may need to have an active service or the premises have been connected to Telstra's network before, however this process is changing and becoming more uncommon as many Australians transition from legacy ADSL type services across to the NBN.
Other factors also include, whether your house is a new build development too. So best to touch base with Optus on your standings with this one.
