Saw this 20GB deal on Optus today, it's pretty cheap compared to buying the Mate 10 Pro outright ($951.20 from Allphones on Ebay).
Offer Conditions:
$10 per extra 1GB
New and recontracting services only.
Excludes trade up customers
Recontracting only available online
Offer ends 26/02/2018 unless withdrawn earlier.
Whilst stock lasts
Huawei Mate 10 Pro 128GB, $64/mth
Total cost $1536, estimated phone cost $576
HTC U11 64GB Black/Silver, $59/mth
Total cost $1416, estimated phone cost $456
This 20GB offer is also available for a number of other phones (existing Ozbargain deals):
iPhone 7 256GB $64/mth
Total cost $1536, estimated phone cost $576 - Out of stock online, but available in Harvey Norman?
Samsung Galaxy S8 64GB Black/Grey/Gold, $59/mth
Total cost $1416, estimated phone cost $456
I have estimated the cost of the phone itself by comparing it to a $40 SIM-only plan from Optus, though clearly this price will change in a year. Your savings will also vary with a different carrier or different data needs. For example, if your comparison mobile plan is lower than $25/mth, you're going to be better off buying outright.
The cost of a comparable, current SIM-only 12mth service from Optus:
$40/mth 15GB - $960 over 24 months
$36/mth 20GB (students only) - $864 over 24 months
This deal possibly a re-release of this bargain from December 2017.
59/m with 200 eftpos card in HN months ago