Cheapest Phone Plan Under $20 Australia

Updated May 11, 2026 · 10 min read

Finding a mobile phone plan under $20 in Australia isn't impossible, but you need to know where to look. While most budget plans hover around the $20-25 mark, there are still some genuine deals available if you're willing to hunt them down or accept promotional pricing.

The good news? Even the cheapest plans now include unlimited standard calls and texts, plus reasonable data allowances. You won't be stuck with pay-as-you-go rates or tiny data caps like the old days.

We've tested and compared every budget provider in Australia to bring you the real deals — not marketing fluff. Prices checked directly from provider websites on May 11, 2026.

Quick answer: TPG Mobile currently offers the cheapest deal at $12.5.0.50/month for 6 months (25GB on Vodafone). For ongoing pricing without promotions, ALDI Mobile at $23/month gives you access to the Telstra network with 12GB of data. Both include unlimited calls and texts.

The Reality of Under-$20 Plans in 2026

Let's be honest: finding a quality mobile plan under $20 per month is challenging. Most established providers have moved their entry-level plans to the $20-30 range. However, there are still a few options worth considering, especially if you're open to promotional deals or don't mind switching providers.

The key is understanding that "under $20" often means promotional pricing or 28-day billing cycles rather than true monthly costs. But with the right approach, you can definitely keep your mobile bill under $20 for at least the first few months.

In my experience researching Australian telcos, the best strategy is to take advantage of introductory offers, then switch before the price increases. It sounds like hassle, but providers make it easy to bring your number across, and the savings are worth it.

Why Are Plans Getting More Expensive?

You might have noticed that bargain-basement plans are harder to find than they were a few years ago. There are a few reasons for this trend:

• Network upgrades: Carriers are investing heavily in 5G infrastructure, and those costs get passed on to consumers
• Data consumption growth: Australians now use an average of 10-15GB per month, up from 3-5GB five years ago. Plans have adjusted to meet this demand
• Consolidation: Fewer players in the market means less price competition at the ultra-budget end
• Inflation: Like everything else, telco costs have risen with broader economic pressures

Despite these headwinds, the MVNO (Mobile Virtual Network Operator) market remains competitive. These providers don't own their own networks — they buy wholesale access from Telstra, Optus, and Vodafone — which lets them undercut the big brands while delivering essentially the same coverage.

Top Budget Plans Compared

Our top pick for under $20: TPG Mobile's current promotion offers 25GB for just $12.50 per month for your first 6 months. After that, it reverts to $25 per month, but you get half a year of substantial savings. This is genuinely one of the best deals available right now.

The TPG deal works out to $12.50/month for six months of service — that's less than what most people pay for two months on a standard plan. If you're willing to switch providers after the promotional period ends, you can keep cycling through similar deals.

What I like about TPG: The sign-up process is straightforward, and their app makes it easy to track your data usage. Vodafone's network has improved significantly in metro areas over the past two years, though it can still be patchy in regional areas. For city dwellers, this is an excellent choice.

The catch: You need to remember to switch after 6 months, or you'll be paying $25/month — still reasonable, but no longer the cheapest option. Set a calendar reminder for month 5 to start shopping around.

Other Budget Options Close to $20

If you're willing to stretch your budget slightly above $20, or want ongoing pricing rather than promotional deals, here are the best alternatives:

ALDI Mobile is the cheapest way to access the Telstra network, which has the best coverage in regional and rural Australia. If you travel outside major cities, this is worth the extra $10.50 per month over TPG's promotional rate.

Why ALDI Mobile stands out: The data rollover feature is genuinely useful. If you use 8GB in month one, you carry 4GB forward to month two. This can build up to a substantial buffer over time — up to 200GB maximum. For light users who don't consume their full allowance monthly, this effectively gives you more value than the headline number suggests.

Coverage reality check: Telstra's network reaches about 99% of the Australian population, compared to Vodafone's ~96%. In practical terms, this means better reception on road trips, in coastal towns, and in regional centres. If you've ever had "No Service" on a Vodafone-based plan while travelling, ALDI Mobile solves that problem.

The trade-off: You get less data (12GB vs 25GB on TPG's promo), and the price is nearly double. But for reliability and coverage, especially outside capital cities, this is the budget plan I recommend most often.

Lebara stands out for international callers — their plans include unlimited calls to 35+ countries. If you have family overseas, this feature alone can save you significant money compared to calling cards or apps.

International call breakdown: Lebara includes unlimited calls to landlines and mobiles in countries including India, China, New Zealand, UK, USA, Canada, and most of Europe. This is built into the base price — no add-ons required.

The 28-day cycle explained: Lebara bills every 28 days rather than calendar monthly. This means 13 billing cycles per year instead of 12. A $25/28 days plan costs $325 annually, which works out to about $25.08 per calendar month. Factor this in when comparing to true monthly plans like TPG or ALDI.

Who should choose Lebara: If you make international calls regularly, this is the best value budget plan available. Even at $25/month (calendar-adjusted), you're saving money compared to a cheaper plan plus international calling credits.

What You Get for Under $20

When you're shopping in the under-$20 range, here's what you can realistically expect:

Data allowances: Most plans in this price range offer 10-25GB of data. TPG's promotional deal gives you 25GB, which is excellent value. ALDI Mobile provides 12GB on the superior Telstra network. For context, the average Australian uses about 10-15GB per month, so these allowances are adequate for most users.

Network coverage: You'll typically access Vodafone or Telstra's wholesale networks. ALDI Mobile uses Telstra's full network, while TPG and Lebara use Vodafone. Both networks provide solid coverage in metropolitan areas and major regional centres. According to the ACCC's latest Mobile Performance Report, Vodafone has improved significantly in regional areas over the past two years.

Call and text inclusions: All modern plans include unlimited standard calls and texts within Australia. You won't need to worry about per-minute charges or message limits. International calls vary by provider — Lebara includes them, while others charge standard rates.

eSIM support: All the providers mentioned above support eSIM, which means you can activate your plan instantly without waiting for a physical SIM card. This is particularly useful if you're switching providers and want to minimise downtime.

Speed Expectations

Here's what you need to know about speeds on budget plans:

• 4G speeds: Most budget plans cap at 4G, which delivers 20-50Mbps in good conditions. This is fast enough for HD video streaming, video calls, and general browsing
• 5G access: Typically reserved for mid-range and premium plans. If 5G matters to you, expect to pay $35-40/month minimum
• Speed throttling: Some unlimited data plans (like Felix Mobile) cap speeds at 40Mbps. This is a deliberate trade-off — unlimited data at slightly slower speeds

For most users, 4G speeds are perfectly adequate. You'd need to be downloading large files regularly or gaming competitively to notice a difference with 5G.

Money-Saving Tips for Budget Plans

Here are some strategies to keep your mobile costs under $20:

1. Take advantage of promotions: TPG's 50% off deal is a perfect example. These promotions can save you significant money in your first 6 months. Set a calendar reminder to switch before the price increases.

2. Consider 28-day billing cycles: Some providers like Lebara use 28-day cycles rather than monthly billing. This means you get 13 billing cycles per year instead of 12, so factor this into your calculations. $25 per 28 days equals about $27.08 per calendar month.

3. Use Wi-Fi whenever possible: Even with decent data allowances, conserving mobile data helps you stay within budget and avoid excess usage charges. Most cafes, libraries, and shopping centres offer free Wi-Fi.

4. Check for data rollover: ALDI Mobile offers data rollover up to 200GB, which means unused data doesn't go to waste. If you consistently use less than your allowance, this feature effectively gives you more value.

5. Look for family or multi-line discounts: Some providers offer discounts when you have multiple services with them. TPG, for example, offers bundle discounts if you also have home internet.

6. Compare annually, not monthly: A $23/month plan costs $276 per year. A $12.50/month promotional plan for 6 months then $25/month costs $225 for the first year. Small monthly differences add up.

The Switching Strategy

Here's a practical approach to minimising your mobile costs long-term:

1. Start with TPG's 6-month promo at $12.50/month
2. Set a reminder for month 5 to start looking for your next deal
3. Research current promos — providers rotate offers throughout the year
4. Switch before the price increases — the process takes about 10 minutes online
5. Rinse and repeat — or settle on a plan that suits your needs long-term

I've tested this approach myself, cycling through 3-4 providers over two years. The key is staying organised — a simple calendar reminder is all you need. Providers make switching easy because they want your business. Your number transfers automatically, and there's minimal downtime (usually less than an hour).

For a step-by-step guide on switching, check out our detailed article on how to switch mobile providers and keep your number.

The Catch with Ultra-Cheap Plans

While finding plans under $20 is possible, there are some trade-offs to consider:

Limited data: You'll typically get 10-25GB compared to 50GB+ on more expensive plans. If you're a heavy data user who streams video frequently, you might find yourself running out before month-end. For heavy users, consider unlimited data plans starting at $40/month.

Promotional pricing: Many under-$20 deals are introductory offers. TPG's $12.50 rate jumps to $25 after 6 months, so you'll need to switch or accept the higher price. The switching process is straightforward — providers handle the number transfer, and you can usually complete it online in under 10 minutes.

Network limitations: Budget providers typically use wholesale networks, which might have slightly different coverage or speeds compared to the full networks. In practice, most users won't notice a difference in metropolitan areas.

Fewer extras: Don't expect international roaming, entertainment subscriptions, or premium customer service at this price point. If you travel internationally frequently, look for plans with included roaming or add-on options.

Speed caps: Some budget plans cap speeds at 4G or even 3G in certain areas. If you need 5G speeds, you'll need to look at mid-range or premium plans. For most everyday tasks like browsing, social media, and streaming, 4G speeds are perfectly adequate.

Customer Service Realities

Budget providers keep costs down partly by minimising customer service overhead. Here's what to expect:

• Online-first support: Most interactions happen via chat, email, or self-service portals. Phone support exists but may have longer wait times
• Limited store presence: Unlike Telstra or Optus, MVNOs don't have retail stores for face-to-face help
• Self-service troubleshooting: You'll be expected to try basic fixes (restart, check settings) before escalating

This isn't necessarily a dealbreaker — many people prefer online support to store visits. But if you value hands-on help, a budget plan might frustrate you when issues arise.

Who Should Choose a Budget Plan?

Budget plans under $20 are ideal for:

• Light data users: If you primarily use Wi-Fi and only need mobile data for maps, messaging, and occasional browsing
• Seniors: Many older Australians don't need large data allowances and prefer simple, affordable plans
• Secondary phones: Backup phones, work phones, or devices used primarily for calls and texts
• Students: Budget-conscious users who want to minimise monthly expenses
• Short-term visitors: People who need Australian service for a few months without long-term commitments
• Regional travellers: If you need Telstra coverage but don't want to pay Telstra prices (ALDI Mobile is perfect here)
• International callers: Lebara's included international calls make it ideal for staying in touch with family overseas

If you fall into any of these categories, a budget plan can save you hundreds of dollars per year compared to mainstream options.

Who Should Avoid Budget Plans?

Budget plans aren't for everyone. Consider spending more if you:

• Need 5G speeds: For gaming, large downloads, or future-proofing
• Travel internationally: Most budget plans charge steep roaming rates. Look for plans with included international roaming
• Want entertainment bundles: Premium plans often include Netflix, Disney+, Spotify, or other subscriptions
• Value premium support: If you want dedicated phone support or in-store help
• Use 50GB+ monthly: Unlimited or high-data plans become better value at this usage level

Understanding where budget plans fit helps you make an informed decision. They're excellent value for the right user — but not a one-size-fits-all solution.

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