Cheapest 300GB Mobile Plans on Telstra
The cheapest 300GB mobile plan on the Telstra network is $289 5G 365 Day Mobile Plan by aldi-mobile at $23.75/mo.
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Forward your bill4 Plans — sorted by price
Showing plans with 300–450GB data on the Telstra network. Postpaid and prepaid only.
Prices validated: 25 June 2026
| Carrier | Plan | Data | Type | 5G | $/mo | Actions | |
|---|---|---|---|---|---|---|---|
 | $289 5G 365 Day Mobile Plan | 300GB | Prepaid | Yes | $23.75 | Visit aldi-mobile | |
 | $365 Prepaid SIM | 365GB | Prepaid | Yes | $30.00 | Visit boost-mobile | |
| $365 Prepaid SIM | 365GB | Prepaid | Yes | $30.00 | Visit boost-mobile | |
 | 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 on the Telstra network?▾
$289 5G 365 Day Mobile Plan by aldi-mobile at $23.75/mo is currently the cheapest 300GB plan on the Telstra network. 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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