Keep Australian Number Active Overseas with eSIM

Yes, you can keep your Australian number active while overseas by utilizing the Dual SIM or eSIM functionality found in most modern smartphones. By setting your physical Australian SIM to receive calls and SMS while assigning a travel eSIM for all cellular data, you can stay connected to your bank accounts and family without paying exorbitant daily roaming fees. This setup allows you to receive essential Two-Factor Authentication (2FA) codes on your Aussie number while enjoying high-speed local data rates on the go.\n\n## The 2FA Dilemma for Australian Travelers\n\nFor many Australian backpackers heading to the islands of Thailand or the bustling streets of Hanoi, the biggest connectivity hurdle isn't just getting data—it is keeping their Australian mobile number reachable. Most Australian banks, including CommBank, Westpac, and ANZ, rely heavily on SMS-based 2FA for verifying transactions, logging into apps, or authorizing new payees. If you swap out your Aussie SIM for a local physical SIM card at a kiosk in Suvarnabhumi Airport, you effectively lose access to your Aussie number, which can leave you locked out of your finances exactly when you need them most.\n\nFurthermore, services like WhatsApp, Signal, and even your Apple ID or Google Account often require SMS verification if you log in from a new device or location. Keeping your Australian line active is no longer a luxury; it is a security necessity. However, leaving your Telstra or Optus SIM active with data roaming turned on is a recipe for a massive bill. Many Australian carriers charge upwards of $10 per day for a roaming pass, which quickly drains a backpacking budget. This is where a travel eSIM from Thai Simcard becomes the ultimate travel hack.\n\n## How Dual SIM Technology Works\n\nMost smartphones released in the last few years, including iPhone 11 and newer, Samsung Galaxy S20 and newer, and Google Pixel 3 and newer, support Dual SIM technology. This means your phone can have two active connections at the same time. You can check compatibility to ensure your specific model is ready for this setup.\n\nIn a typical travel scenario, your Australian number remains on your physical SIM card (or your primary eSIM), and you add a secondary travel eSIM for your destination. You then configure your phone's settings to use the Aussie SIM for "Default Voice Line" and the Thai Simcard eSIM for "Cellular Data." This configuration tells your phone to ignore the Aussie SIM's expensive data network while still listening for incoming texts and calls.\n\n## Comparing Costs: Aussie Roaming vs. Travel eSIMs\n\nBefore you depart from Sydney or Melbourne, it is worth looking at what your home carrier offers. While some plans include "International Roaming," most standard Aussie plans will charge you a daily fee the moment your phone connects to a foreign tower. These fees usually provide a small amount of data, often capped at 500MB or 1GB, after which you are charged more or throttled to useless speeds.\n\n| Feature | Australian Carrier Roaming | Thai Simcard eSIM + Aussie SIM |\n|---|---|---|\n| Daily Cost | High ($5 - $15 per day) | Low upfront cost |\n| Data Allowance | Often limited | Flexible (up to 20GB or Daily Passes) |\n| 2FA SMS Reception | Yes | Yes |\n| Local App Integration | Sometimes buggy | Seamless (Grab, Bolt, ShopeeFood) |\n| Network Quality | Varies | 5G (Optus in AU, Spark in NZ) |\n\nBy choosing to see plans for your journey, you can select a data package that fits your specific needs rather than being forced into a one-size-fits-all roaming pack. For those starting their journey in Australia or New Zealand before heading north to Asia, our regional plans utilize the Optus 5G network in Australia and the Spark 5G network in New Zealand, ensuring top-tier speeds.\n\n## Thai Simcard Plans for Australia and Beyond\n\nIf you are a global traveler currently in Australia or planning a trip across the Tasman, having a reliable data source is vital. We offer a variety of fixed and daily plans tailored for the region. Our fixed plans include options like 1GB for 7 days, 3GB for 15 days, and larger buckets like 3GB, 5GB, 10GB, or 20GB for a 30-day period. These are perfect for travelers who know their usage patterns.\n\nFor those who prefer a daily refresh, we provide several tiers: 0.48828125GB per day (roughly 500MB), 1GB, 2GB, or 3GB per day with a throttle to 512 Kbps after the limit is reached. For heavy users, we even offer 5GB or 10GB per day options (throttled to 384 Kbps after). These are data-only plans, meaning they do not come with a local phone number, but they fully support WhatsApp calls, FaceTime, and VoIP services. You can easily top up your data if you run low while exploring.\n\n## Step-by-Step Setup: Keeping Your Aussie Number Active\n\nOnce you have selected your eSIM, the installation process is straightforward. It is best to do this while you still have a stable Wi-Fi connection, perhaps at home before you head to the airport.\n\n### For iPhone Users\n1. Go to Settings > Cellular (or Mobile Data).\n2. Tap Add eSIM and scan the QR code provided by Thai Simcard.\n3. Label your Australian SIM as "Primary" and your new eSIM as "Travel" or "Data."\n4. Set Default Voice Line to "Primary" (this ensures people can still call your Aussie number).\n5. Set Cellular Data to "Travel."\n6. Crucial Step: Toggle off Cellular Data Switching. This prevents your phone from accidentally using your Aussie SIM for data if the eSIM signal is weak.\n7. Ensure Data Roaming is ON for the "Travel" eSIM and OFF for the "Primary" Aussie SIM.\n\n### For Android Users\n1. Go to Settings > Network & Internet > SIMs.\n2. Tap Add More or Download a SIM instead? and scan the QR code.\n3. Once activated, go to your SIM manager.\n4. Select your Thai Simcard eSIM for Data.\n5. Select your Australian SIM for Calls and SMS.\n6. Ensure Data Roaming is disabled for your Australian SIM to avoid unexpected charges.\n\nFor a more detailed walkthrough, you can read our full how it works guide.\n\n## Navigating Southeast Asia with Your eSIM\n\nOnce you land in Bangkok or Ho Chi Minh City, the benefits of having a pre-installed eSIM become immediately apparent. Instead of queuing at a kiosk and paying inflated airport prices, your phone will connect to the local network as soon as you disable Airplane Mode. This instant connectivity is essential for using ride-hailing apps.\n\nIn Thailand, you will likely find yourself choosing between different transport options. Knowing Bolt vs Grab Thailand can save you a lot of money, as prices fluctuate based on the time of day and area. Having local data allows you to check both apps simultaneously. Similarly, if you are heading south, choosing the best SIM card for Phuket often means avoiding the airport lines and sticking with a digital solution that works the moment you step off the plane.\n\nIn Vietnam and Cambodia, data coverage in cities like Hanoi or Phnom Penh is excellent, often reaching 4G+ or 5G speeds. However, if you venture into more rural areas or take a boat out on the water, coverage can become spotty. Having a reliable eSIM ensures you can still load maps or translate menus when you are off the beaten path. These eSIMs are data-only, which is perfect for travelers who primarily use messaging apps to stay in touch.\n\n## Managing Your Australian SIM While Abroad\n\nWhile your Aussie SIM is active for 2FA, you should be aware of "Wi-Fi Calling." Many Australian carriers allow you to make and receive calls over Wi-Fi as if you were still in Australia. If you are connected to a hotel Wi-Fi or your travel eSIM's hotspot, your phone might use Wi-Fi Calling to handle your Aussie number's traffic. This can sometimes help avoid international call rates, but always check with Telstra, Optus, or Vodafone regarding their specific Wi-Fi calling roaming policies.\n\nAnother tip for backpackers is to use a "travel-friendly" bank like Up, Macquarie, or Revolut. These banks often have more streamlined 2FA processes that might use in-app notifications rather than SMS, but having your Aussie number active as a backup is always the safest bet.\n\n## Why Travelers Trust Thai Simcard\n\nWe specialize in providing seamless connectivity for the modern nomad. Whether you are trekking through the jungles of Chiang Mai or working remotely from a cafe in Canggu, our goal is to remove the friction of local SIM cards. By offering regional plans that cover multiple countries, such as our Australia and New Zealand dual-coverage plan, we allow you to cross borders without changing your settings. When you see plans on our store, you are getting access to premium networks like Optus and Spark, ensuring you spend less time worrying about signal bars and more time enjoying your trip.\n\n## The bottom line\n\nKeeping your Australian number active while overseas is the smartest way to manage your security and finances. By using a Thai Simcard eSIM for your data needs and keeping your Aussie SIM for 2FA, you get the best of both worlds: affordable, high-speed internet and uninterrupted access to your bank and personal accounts. Simply install the eSIM before you fly, configure your Dual SIM settings correctly, and enjoy your adventure without the fear of roaming bill shock.