Telstra vs Optus: Why International Roaming is a Rip-off

Telstra international roaming costs $10 per day for a limited 2GB data allowance, which can quickly lead to massive bills during a multi-week trip. Opting for a travel eSIM allows you to access local networks like Optus in Australia or Spark in New Zealand at a fraction of the cost, without the risk of hidden roaming fees. By switching to a digital solution before you fly, you avoid the daily 'convenience' tax imposed by major Australian carriers.

The Australian Roaming Reality Check

For many Australian backpackers, the excitement of landing in Bangkok or Ho Chi Minh City is quickly dampened by a text message from Telstra or Optus. It usually reads something like this: "Welcome to Thailand! International roaming has been activated for $10 per day." At first glance, $10 doesn't seem like much. But for a traveler on a three-week journey through Southeast Asia, that is $210 added to your phone bill just for the privilege of using the data you already pay for at home.

Telstra and Optus rely on a business model of convenience. They know that when you land, you need to book a Grab, check your hostel location on Google Maps, or message your family to say you arrived safely. They bank on you being too tired or overwhelmed to find a local solution, so they charge a premium. When you compare the telstra international roaming cost to the flexibility of a dedicated travel eSIM, the difference in value is staggering.

Telstra vs Optus: Comparing the Costs

Both major Australian carriers offer roaming packages, but they are rarely designed with the budget traveler in mind.

Telstra International Roaming

Telstra generally offers an "International Roaming Pass." For $10 per day, you get a small daily data limit (usually 2GB). If you exceed that 2GB by uploading too many Instagram stories or watching a YouTube video at the airport, you are often throttled to unusable speeds or charged extra. Furthermore, the pass is triggered the moment you use a single kilobyte of data or send a text, meaning you could be charged for a full day even if you only turned your phone on for five minutes.

Optus Roaming Options

Optus typically offers a $5 per day roaming pass, which provides 5GB of data. While cheaper than Telstra, it still suffers from the same daily-reset trap. If you don't use the 5GB, you lose it. If you stay for 30 days, you are still looking at a $150 bill. For a deeper dive into these specific costs, you can read our guide on Optus Roaming vs Travel eSIM: Which is Cheaper?.

Feature	Telstra Roaming	Optus Roaming	Thai Simcard eSIM
Daily Cost	~$10	~$5	None (Fixed Plan)
Data Expiry	24 Hours	24 Hours	Up to 30 Days
Network	Varied Partners	Varied Partners	Optus / Spark (5G)
Bill Shock	High Risk	Moderate Risk	Zero Risk (Prepaid)

Why Travel eSIMs Beat Local Kiosks

Many travelers think the solution is to wait until they arrive at Suvarnabhumi Airport in Bangkok or Tan Son Nhat in Vietnam to buy a physical SIM card. While local SIMs are cheaper than roaming, the airport kiosks are notorious for "tourist pricing." You will often find long queues, pushy sales tactics, and plans that are significantly more expensive than what locals pay in the city.

By choosing Thai Simcard, you bypass the airport chaos entirely. You can see plans for Australia, New Zealand, and broader Southeast Asia before you even pack your bags. Because our plans are digital, you can install them while still sitting on your couch in Melbourne or Sydney. When the plane touches down, you simply toggle the eSIM on, and you are instantly connected to 5G networks like Optus in Australia or Spark in New Zealand.

Seamless Integration with Travel Apps

One of the biggest advantages of using a travel eSIM is the ability to use local apps without friction. In Southeast Asia, apps like Grab (for transport and food) and FoodPanda are essential. These apps require a stable data connection to track your driver and process payments.

Because Thai Simcard provides data-only plans, you don't get a local phone number, but this is actually a benefit for modern travelers. You keep your Australian WhatsApp, iMessage, and Telegram linked to your original number, while the eSIM handles the heavy lifting of data. This means you can call your Grab driver via the app or make WhatsApp calls to friends without ever needing a traditional voice line. If you are planning a trip to the islands, having reliable data is crucial for navigating Thailand Island Hopping Routes: Andaman vs Gulf Coast.

Coverage: Cities vs Rural Areas

When traveling through Australia or New Zealand, coverage is king. Telstra often boasts about rural coverage, but for travelers sticking to the East Coast, the Outback tracks, or the major cities in NZ, the Optus and Spark 5G networks provided by Thai Simcard are world-class.

• In Australia: You will get high-speed 5G/4G coverage across all major metros (Sydney, Brisbane, Melbourne, Perth) and reliable 4G in coastal backpacker hubs like Byron Bay or Airlie Beach.
• In New Zealand: The Spark network is renowned for its reach, ensuring you have signal whether you are bungee jumping in Queenstown or exploring the North Island's volcanic plateaus.

Choosing the Right Plan for Your Trip

We offer a wide range of plans tailored to how you actually use your phone. If you are a light user who just needs Google Maps and occasional messaging, a fixed plan like 3GB for 15 days or 5GB for 30 days is ideal. For digital nomads or heavy social media users, we offer 10GB and 20GB monthly plans, as well as daily passes ranging from 1GB to 10GB per day.

Before purchasing, ensure your device is unlocked and supports eSIM technology by checking our phone compatibility guide. Most iPhones from the XS onwards and recent Samsung Galaxy/Google Pixel phones are ready to go.

Step-by-Step: How to Install Your eSIM

Setting up your connection is simple and doesn't require any technical expertise. Once you buy your plan, you will receive a QR code via email.

For iPhone Users:

1. Go to Settings > Cellular.
2. Tap Add eSIM.
3. Select Use QR Code and scan the code provided by Thai Simcard.
4. Label the new plan as "Travel" and set it as your secondary data line.

For Android Users:

1. Go to Settings > Connections > SIM Manager.
2. Tap Add eSIM or Add Mobile Plan.
3. Scan the QR code.
4. Ensure "Data Roaming" is turned on for the new eSIM profile.

For a more detailed walkthrough, visit our guide on how to install and activate your digital SIM.

Avoiding the "Bill Shock" Trap

"Bill shock" is the term for that sinking feeling you get when you open your post-holiday credit card statement and see hundreds of dollars in roaming fees. It happens because background apps—like iCloud Photo Library or automatic app updates—continue to run in the background, consuming your expensive Telstra or Optus roaming data without you realizing it.

With a Thai Simcard eSIM, bill shock is impossible. Our plans are strictly prepaid. If you use up your 10GB, the data simply stops. You can then choose to top up through our website if you need more. There are no hidden fees, no "overage" charges, and no surprise bills waiting for you at home.

The bottom line

Telstra and Optus roaming fees are an unnecessary expense for the modern traveler. By switching to a travel eSIM, you gain access to the same premium networks at a fraction of the cost, with the added benefit of a 100% digital setup. Whether you are trekking through New Zealand or navigating the vibrant streets of Thailand, staying connected shouldn't cost as much as your flight. Choose a smarter way to travel, save your money for the experiences that matter, and leave the roaming rip-offs behind.