Cheap Postpaid Mobile Plans Under $15
In our database, we're comparing 15 postpaid mobile plans priced at $15 a month or less from 10 providers across the Telstra, Optus and TPG networks (TPG's network also covers Vodafone-branded plans). Prices in this list run from $9.90 to $15.00 a month, averaging $13.07, with data allowances from 500MB up to 75GB. Not every plan on this list stays under $15 for long, though -- 7 of the 15 are genuinely $15-or-under with no price increase, while the other 8 only start below $15 as a limited-time promo and revert to a higher regular price afterwards -- in one case nearly tripling. We've split the tables below so you can tell the difference at a glance.
(E.Tel, promo)
(Cmobile)
Genuinely $15-or-under, no price hike (7 plans)
Sorted by cost per GB (regular price), lowest first. These plans cost the same now as they will on renewal -- what you see is what you keep paying.
| Provider | Plan | Network | Data | Talk & Text | Price | Cost / GB | |
|---|---|---|---|---|---|---|---|
| AQUA Mobile | $15 Monthly SIM Only Plan | Optus | 10GB (4G) | Unlimited | $15.00 / 30 days | $1.50 | -- |
| Cmobile | 5GB Red Data Only Mobile Plan | TPG | 5GB (4G) | N/A | $15.00 / 30 days | $3.00 | -- |
| Cmobile | 3GB Red Unlimited Mobile Plan | TPG | 3GB (4G) | Unlimited | $14.90 / 30 days | $4.97 | -- |
| Cmobile | 2 GB Red Unlimited Mobile Plan | TPG | 2GB (4G) | Unlimited | $13.90 / 30 days | $6.95 | -- |
| Cmobile | 1GB Red Data Only Mobile Plan | TPG | 1GB (4G) | N/A | $10.00 / 30 days | $10.00 | -- |
| Cmobile | 1GB Red Unlimited Mobile Plan | TPG | 1GB (4G) | Unlimited | $12.90 / 30 days | $12.90 | -- |
| Cmobile | 500MB Red Unlimited Mobile Plan | TPG | 500MB | Unlimited | $10.90 / 30 days | N/A | -- |
Starts under $15, price increases later (8 plans)
Sorted by current advertised price, lowest first. "Now" is the price you'll pay today; "Then" is the regular price it reverts to once the promo period ends.
| Provider | Plan | Network | Data | Talk & Text | Now | Then (regular) | |
|---|---|---|---|---|---|---|---|
| E.Tel | Value 25GB | Optus | 25GB (4G) | Unlimited | $9.90 | $24.90 | -- |
| Vodafone | Small Data SIM Only Plan | TPG | 60GB (4G,5G) | N/A | $10.00 | $20.00 | -- |
| Coles Mobile | Coles 45GB Month to Month Mobile Plan | Optus | 75GB (4G,5G) | Unlimited | $12.00 | $35.00 | -- |
| Aussie Broadband | Saver Mobile Plan | Optus | 20GB (4G,5G) | Unlimited | $12.50 | $25.00 | -- |
| SpinTel | 25GB SIM Only Mobile Plan | Optus | 25GB (4G,5G) | Unlimited | $14.00 | $22.00 | -- |
| Dodo | $30 Unlimited Mobile Plan | Optus | 40GB (4G) | Unlimited | $15.00 | $30.00 | -- |
| Flip | 10GB Mobile Plan | Optus | 10GB (4G) | Unlimited | $15.00 | $24.90 | -- |
| Tangerine Telecom | 14GB 4G Mobile SIM | Telstra | 14GB (4G) | Unlimited | $15.00 | $25.00 | -- |
Compare by network
Not sure if Optus reaches your address? Check Optus coverage
Not sure if TPG reaches your address? Check TPG coverage
Not sure if Telstra reaches your address? Check Telstra coverage
Genuinely $15-or-under, by network speed
Only the 7 plans that stay $15-or-under long-term (no promo price hike) are included here. None of them support 5G in our database -- they're all 4G, aside from one plan with unspecified speed noted below.
4G (6 plans)
Cmobile's 500MB Red Unlimited Mobile Plan ($10.90/month, TPG) isn't shown above -- our data source doesn't specify a network speed for this plan.
Frequently asked questions
Prices and data allowances shown are current in our database as of July 2026 and reflect advertised carrier pricing at time of listing. Where a plan has an introductory promo, we show both the current and regular price so you can see the true long-term cost. Plans, prices and inclusions change frequently, and details are entered into our database manually so errors are possible -- we do not guarantee the accuracy of any price, allowance, or other detail shown. Always confirm the final price and all plan information directly with the carrier before signing up.