Not a dupe of this because the 50% discount is for 6 months, not 4, in combination with the elevated $70 cashback from TopCashback. Duplicate cashback offer removed from title — Mod.
Maths
If you stay for the full 6 month discount period:
$15 x 6 - $70 = $20.
Total cost averages to $3.33 per month.
If you want to hardcore min-max and only stay for the minimum 3 months to qualify for cashback:
$15 x 3 - $70 = -$25.
Total profit averages to $8.33 per month.
If you go down this path, please be careful with the exact definition of 90 days.
Basic info for newbies:
- Optus network, shared with Vodafone in regional areas,
- No eSIM, a significant chunk of Optus resellers don't have it whilst similar competitors using Vodafone seem to offer it more readily,
- Postpaid, so you have to time the end of the discount period diligently to avoid paying full price,
- Dodo's online portal and mobile app are horrible to use, so setting your own calendar reminders is helpful, however once you do manage to get past the login process, they do tell you when the discount period ends for each mobile service.
- These plans have "unlimited" data in the sense that the headline data allocation is at full speed while anything after is slowed to 256Kbps. That should be just about usable for emergencies such for public transport apps, internet banking, Facebook Messenger or WhatsApp messages, Google Maps navigation, etc.
- The above also means there are no excess data charges.
- Cashback delay is set to 6 months by Dodo. TopCashback has no control over this.
- SIM must be activated within a month and you must stay with them for 3 months.
Less important stuff
Dodo's 40GB and 80GB postpaid mobile plans are almost permanently "on sale" all year round for 50% off for 4 months, so they can be called "fake discounts" similar to what Coles and Woolworths are currently being accused of.
Occasionally they will upsize the 4 month discount to 6 months, which is what has happened here.
If your phone SIM tray supports 2 physical SIMs, rather than porting your main number, it may be a good idea to get a new disposable number with Dodo to avoid stress with porting out on the exact right day at the end of the discount period.
Instead, you just request the disposable number be cancelled on the last discounted month.
I.e. Have your main number on the $60 yearly call and text only plan from Amaysim or $10 yearly PAYG plan from Lebara (depending on how much you call and text others via main number) and use the Dodo SIM for data.
Dodo support is a mess to deal with IMO and their app is clunky 2000s style