I was previously subscribed to netflix via Apple Itunes (taking advantage of the 15-25% off itunes cards as a true ozbargainer would), I then cancelled my itunes subscription sometime in July last year so that I could take advantage of this deal. Now that I've used up all of my credits, I've decided to cancel my subscription and switch back to subscribing via apple itunes and was automatically given a 1 month free trial using my existing account.
Now I'm not sure how long you'd have to wait after cancelling your subscription via itunes in order to qualify for the free trial but I was last subscribed in July 2017 so it's definitely under a year. Just to clarify, you do not need to get a new account or change accounts as both my subscription via itunes and directly through netflix is for the same account.
So this is a bit of a hack and might not be worth it for those who are currently subscribed via itunes to cancel their subscription, wait for however many months and then resubscribe. However, if you've previously subscribed via itunes but are no longer doing that, it might be worth checking out to see if you qualify for the 1 month trial.
edit: BlackMonk mentioned that he was able to get the free trial one month after he cancelled.
only 2 screens free tho