Cheapest 80GB Mobile Plans on Optus
What's the cheapest mobile plan?
The cheapest 80GB mobile plan on the Optus network is $200 Prepaid SIM by optus at $32.26/mo.
Not sure if it's worth switching?
Forward your current broadband bill to uploads@billhero.com.au — we'll check whether a cheaper plan is available and handle the switch for a $25 success fee.
Forward your bill17 Plans — sorted by price
Showing plans with 80–120GB data on the Optus network. Postpaid and prepaid only.
Prices validated: 4 Nov 2026
| Carrier | Plan | Data | Type | 5G | eSIM | $/mo | Actions | |
|---|---|---|---|---|---|---|---|---|
 | $200 Prepaid SIM | 100GB | Prepaid | Yes | Yes | $32.26 | Visit optus | |
 | 80GB 5G SIM Plan | 80GB | Postpaid | Yes | — | $34.00 | Switch — $25 | |
 | Pro | 105GB | Prepaid | No | Yes | $34.90 | Visit yomojo | |
 | 100GB | 100GB | Postpaid | Yes | Yes | $35.00 | Switch — $25 | |
| 100GB SIM Only | 100GB | Postpaid | Yes | Yes | $35.00 | Switch — $25 | |
 | 80GB 28 Day SIM Plan | 80GB | Prepaid | Yes | Yes | $42.86 | Visit amaysim | |
 | 28 Days Plan 80GB | 80GB | Prepaid | Yes | — | $42.86 | Visit catch-connect | |
 | 5G Medium | 100GB | Postpaid | Yes | — | $45.00 | Switch — $25 | |
 | Medium | 80GB | Postpaid | Yes | Yes | $45.00 | Switch — $25 | |
| 125GB 28 Day SIM Plan | 95GB | Prepaid | Yes | Yes | $48.21 | Visit amaysim | |
 | Essential 100GB | 100GB | Postpaid | Yes | Yes | $50.00 | Switch — $25 | |
| Essential 100gb | 100GB | Postpaid | Yes | — | $50.00 | Switch — $25 | |
 | Lifestyle Mobile - Plus | 100GB | Postpaid | Yes | Yes | $50.00 | Switch — $25 | |
| 120GB 28 Day SIM Plan | 120GB | Prepaid | Yes | Yes | $53.57 | Visit amaysim | |
 | 100GB | 100GB | Postpaid | No | — | $54.90 | Switch — $25 | |
| Premium 120GB | 120GB | Postpaid | Yes | — | $60.00 | Switch — $25 | |
 | 80GB Data | 80GB | Postpaid | No | — | $65.00 | Switch — $25 |
Bill Hero is an independent comparison service. We are paid by subscribers and concierge fees, not by carriers or retailers.
Frequently Asked Questions
What is the cheapest 80GB mobile plan on the Optus network?
$200 Prepaid SIM by optus at $32.26/mo is currently the cheapest 80GB plan on the Optus network. Prices are updated daily.
Should I choose postpaid or prepaid for a 80GB plan?
Postpaid plans typically include handset financing options and are billed monthly. Prepaid plans are pay-as-you-go — better for flexibility and no credit checks. Both are shown in the table above.
How often are mobile plan prices updated?
Bill Hero checks mobile plan data daily. All plans shown were validated within the last 24 hours. See the "Prices validated" date above the table for the most recent check.
Can I switch mobile plans without changing my number?
Yes. Mobile number portability (MNP) lets you keep your number when switching carriers or networks. The process usually takes 1–2 business days.
AutoMonitor
Turn on AutoMonitor. Your retailers send your bills straight to your Bill Hero address; we watch every bill for savings — automatically. $49/mo. Save money without even thinking about it.
Learn about AutoMonitor