Cheapest 300GB Mobile Plans — Any Network
The cheapest 300GB mobile plan across all networks is 4G Core by circles-life at $10.80/mo.
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Forward your bill11 Plans — sorted by price
Showing plans with 300–450GB data across all networks. Postpaid and prepaid only.
Prices validated: 26 July 2026
| Carrier | Plan | Data | Type | 5G | $/mo | Actions | |
|---|---|---|---|---|---|---|---|
 | 4G Core | 350GB | Postpaid | No | $10.80 | Switch — $25 | |
| Circles Plus | 300GB | Postpaid | Yes | $10.99 | Switch — $25 | |
| Circles Plus 5G | 300GB | Postpaid | Yes | $18.00 | Switch — $25 | |
 | Large (365 days) | 300GB | Prepaid | No | $19.73 | Visit kogan-mobile | |
 | 365 Days Plan 360GB | 360GB | Postpaid | Yes | $24.66 | Switch — $25 | |
 | 5G Prepaid Long Expiry $320 for 300GB | 300GB | Prepaid | Yes | $26.30 | Visit woolworths-mobile | |
 | $365 Prepaid SIM | 365GB | Prepaid | Yes | $30.00 | Visit boost-mobile | |
| 5G SIM Only $54 for 330GB | 330GB | Postpaid | Yes | $54.00 | Switch — $25 | |
 | Large Plan | 420GB | Postpaid | Yes | $78.00 | Switch — $25 | |
 | Promo Plan | 360GB | Postpaid | Yes | $79.00 | Switch — $25 | |
 | Premium | 300GB | Postpaid | 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.
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