Cheapest 300GB Mobile Plans — Any Network
The cheapest 300GB mobile plan across all networks is 4G Core by circles-life at $10.80/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 bill14 Plans — sorted by price
Showing plans with 300–450GB data across all networks. Postpaid and prepaid only.
Prices validated: 15 Aug 2026
| Carrier | Plan | Data | Type | 5G | eSIM | $/mo | Actions | |
|---|---|---|---|---|---|---|---|---|
 | 4G Core | 350GB | Postpaid | No | Yes | $10.80 | Switch — $25 | |
| Circles Plus | 300GB | Postpaid | Yes | Yes | $18.00 | Switch — $25 | |
 | Large - 365 Day Prepaid Plan | 300GB | Prepaid | No | Yes | $19.73 | Visit kogan-mobile | |
 | $289 5G 365 Day Plan | 300GB | Prepaid | Yes | Yes | $23.75 | Visit aldi-mobile | |
 | 360GB 365 Day Plan | 360GB | Postpaid | Yes | — | $24.66 | Switch — $25 | |
| 365 Days Plan 360GB | 360GB | Prepaid | Yes | — | $24.66 | Visit catch-connect | |
 | $300 SIM Plan | 425GB | Prepaid | Yes | Yes | $24.66 | Visit lebara | |
 | Prepaid Long Expiry 300GB | 300GB | Prepaid | Yes | Yes | $26.30 | Visit woolworths-mobile | |
 | LycaPlan L | 300GB | Prepaid | No | Yes | $53.57 | Visit lycamobile | |
| 5G SIM Only $54 | 330GB | Postpaid | Yes | Yes | $54.00 | Switch — $25 | |
| 5G SIM Only 330GB | 330GB | Postpaid | Yes | Yes | $60.00 | Switch — $25 | |
 | Large SIM Only Plan | 420GB | Postpaid | Yes | Yes | $78.00 | Switch — $25 | |
 | Optus Plus Promo Plan | 360GB | Postpaid | Yes | Yes | $79.00 | Switch — $25 | |
 | Premium | 300GB | Postpaid | Yes | Yes | $99.00 | 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 300GB mobile plan across all networks?▾
4G Core by circles-life at $10.80/mo is currently the cheapest 300GB plan across all networks. Prices are updated daily.
Should I choose postpaid or prepaid for a 300GB 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