Cheapest 40GB Mobile Plans on Optus
The cheapest 40GB mobile plan on the Optus network is 50GB by spintel at $29.00/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 bill15 Plans — sorted by price
Showing plans with 40–60GB data on the Optus network. Postpaid and prepaid only.
Prices validated: 26 July 2026
| Carrier | Plan | Data | Type | 5G | $/mo | Actions | |
|---|---|---|---|---|---|---|---|
 | 50GB | 50GB | Postpaid | Yes | $29.00 | Switch — $25 | |
 | 40GB 5G SIM Plan | 40GB | Postpaid | Yes | $29.00 | Switch — $25 | |
 | Essential | 42GB | Prepaid | No | $29.90 | Visit yomojo | |
| Essential | 42GB | Prepaid | No | $29.90 | Visit yomojo | |
 | 40GB | 40GB | Postpaid | Yes | $30.00 | Switch — $25 | |
 | Medium Plan | 50GB | Postpaid | Yes | $35.00 | Switch — $25 | |
 | 75GB 28 Day Plan | 42GB | Prepaid | Yes | $37.50 | Visit amaysim | |
 | Value 40GB | 40GB | Postpaid | Yes | $40.00 | Switch — $25 | |
 | Lifestyle Mobile - Essential | 50GB | Postpaid | Yes | $40.00 | Switch — $25 | |
| Value 45gb | 45GB | Postpaid | Yes | $40.00 | Switch — $25 | |
 | Small | 40GB | Postpaid | Yes | $40.00 | Switch — $25 | |
 | 75GB 28 Days | 40GB | Prepaid | Yes | $53.57 | Visit optus | |
 | 40GB Data | 40GB | Postpaid | No | $55.00 | Switch — $25 | |
| Small Choice Plus Plan | 60GB | Postpaid | Yes | $60.00 | Switch — $25 | |
| 85GB 28 Days Online Only | 45GB | Prepaid | Yes | $68.57 | Visit optus |
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 40GB mobile plan on the Optus network?▾
50GB by spintel at $29.00/mo is currently the cheapest 40GB plan on the Optus network. Prices are updated daily.
Should I choose postpaid or prepaid for a 40GB 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