ZollyMonsta: As the TV advert says 'Look after the customers who look after you'.? That's why the deal is only being offered to TelstraClear customers.
Actually, that's just some very clever marketing spin. It's just a very nice way of breaking the news that you must also shift your landline and your broadband to them if you want it. The deal is open to anyone, in reality, as long as you're prepared to do that. They're not actually interested in 'rewarding' you, they just want all your business and they found a very nice way of positioning that.