Keep Australian Number Overseas: A Traveler's Guide

To keep your Australian number overseas while avoiding massive roaming bills, the most effective strategy is to port your number to a long-expiry prepaid plan before you depart and then use a travel eSIM for all your data needs. By keeping your Australian SIM active in your phone but disabling 'Data Roaming' for that specific line, you can continue to receive vital SMS messages—like bank two-factor authentication (2FA) codes—for free while using a Thai Simcard for high-speed internet access.\n\n## Why You Need to Keep Your Australian Number\n\nFor many Australian backpackers heading to Southeast Asia or Europe, the first instinct is to cancel their home phone plan to save money. However, in the modern era of digital banking and travel apps, your Australian mobile number is more than just a way to call home; it is your digital identity. Many Australian banks, government services like myGov, and even social media platforms require a one-time password (OTP) sent via SMS to verify your identity. If you cancel your number, you may find yourself locked out of your accounts while sitting in a cafe in Bangkok or a hostel in Hanoi.\n\nFurthermore, apps like Grab and Bolt are essential for navigating Thailand and Vietnam. If you have already linked your Australian mobile number and debit card to these apps, keeping that number active ensures a seamless transition. You can read more about linking Australian debit cards to Grab to ensure you are ready before you land. Keeping your number active allows you to maintain these accounts without needing to re-verify with a local foreign number that you might only have for a few weeks.\n\n## Choosing the Best 'Holding' Plan\n\nIf you are currently on a month-to-month contract with Telstra or Optus that costs $60 or more, you are overpaying for a service you won't fully use while abroad. The goal is to move your number to a 'holding' plan—typically a long-expiry prepaid SIM. These plans allow you to keep your number active for 365 days for a relatively small upfront cost. Major providers like Boost Mobile (which uses the full Telstra retail network) and Amaysim (which uses the Optus network) offer excellent long-expiry options.\n\nBy switching to a prepaid plan with a 365-day expiry, you ensure your number stays yours for the duration of your trip. You won't have to pay monthly fees, and you can still receive incoming SMS messages for free in most countries, provided you have global roaming enabled on the account (but data roaming turned off). This is a crucial distinction: keeping the SIM active to receive texts is free, but using it to browse the web is where the high costs occur. You can learn more about how to receive Telstra SMS in Thailand without fees to better manage your settings.\n\n## The Dual-SIM Strategy: Your Secret Weapon\n\nModern smartphones, including most iPhone and Samsung models, support Dual-SIM technology. This means you can have your physical Australian SIM card in the slot (or as an eSIM) and a travel eSIM from Thai Simcard active at the same time. This setup is the gold standard for international travel. You designate the Thai Simcard for all 'Cellular Data' and your Australian SIM for 'Default Voice Line' and SMS.\n\nWhen you land in your destination, you simply toggle your travel eSIM on. Because Thai Simcard provides data-only plans, there is no local phone number attached to the eSIM, which prevents any confusion with your existing apps like WhatsApp or Signal. Your Australian number stays active for messages, while your travel eSIM provides the data needed for Google Maps, Instagram, and booking rides. To ensure your device is ready, you can check if your phone is compatible before purchasing.\n\n## Connectivity in Australia and Beyond\n\nIf you are traveling within Australia or just preparing for a trip, Thai Simcard offers extensive coverage using the Telstra (5G) and Optus (5G) networks. This is particularly useful for international travelers arriving in Australia who want to avoid the high prices of airport kiosks. The coverage is robust in major cities like Sydney, Melbourne, and Brisbane, as well as regional hubs. However, when heading into the deep Outback, the Telstra network remains the superior choice for reach.\n\nThai Simcard provides a variety of fixed plans for those visiting Australia, ranging from small 100MB/7 days, 500MB/7 days, and 1GB/7 days options for short stays, to larger 3GB/30 days, 5GB/30 days, 10GB/30 days, 20GB/30 days, and 50GB/30 days plans for heavy users. For long-term visitors, a 50GB/180 days plan is also available. If you prefer a daily allowance, there are passes offering 1GB, 2GB, 3GB, 5GB, or even 10GB per day, with tiered speeds after the daily limit is reached. You can see plans to find the one that fits your itinerary.\n\n## Comparing Roaming Options\n\nTraditional roaming with Australian carriers is often prohibitively expensive. Telstra and Optus typically charge a daily fee (often $5 to $10) for an 'International Day Pass' which only gives you a small amount of data. If you are away for 30 days, you could be looking at a bill of $300 just for phone access. In contrast, using a travel eSIM is a fraction of the cost.\n\n| Feature | Australian Carrier Roaming | Thai Simcard eSIM |\n| :--- | :--- | :--- |\n| Daily Cost | High ($5-$10/day) | None (Prepaid) |\n| Data Limits | Usually 500MB-1GB/day | Flexible (up to 50GB) |\n| Network | Varies by partner | Telstra / Optus 5G |\n| Ease of Use | Automatic (Expensive) | Simple digital install |\n| Number Retention | Yes | Yes (via Dual-SIM) |\n\n## How to Install Your Travel eSIM\n\nThe process of setting up a travel eSIM is entirely digital. There is no need to wait for a physical card in the mail or find a SIM tool to open your phone tray. Once you purchase your plan, you receive a QR code via email. For iPhone users, go to Settings > Cellular > Add eSIM and scan the code. For Android users, the process is similar under Network & Internet settings. We have a detailed setup guide that walks you through the process step-by-step.\n\nOnce installed, the most important step is to label your SIMs. Label your Australian SIM as 'Home' and your travel eSIM as 'Travel'. Ensure that 'Data Roaming' is turned OFF for your 'Home' SIM and ON for your 'Travel' eSIM. This prevents your Australian carrier from charging you for accidental data usage. Since these are data-only plans, you will use apps like WhatsApp, Messenger, or FaceTime for voice calls, which works perfectly over the high-speed data provided.\n\n## Managing Data Needs by Activity\n\nUnderstanding how much data you need is key to choosing the right plan. If you are mostly using your phone for Google Maps and occasional social media posts, a 3GB or 5GB monthly plan is usually sufficient. However, if you are a digital nomad or someone who streams video in hostels, you should look at the 20GB or 50GB options. \n\n* Google Maps: Approximately 5MB per hour of active navigation.\n* Social Media (Instagram/TikTok): Can consume up to 600MB per hour of scrolling.\n* WhatsApp Calling: Roughly 0.5MB per minute for voice calls.\n* Streaming (Netflix/YouTube): 1GB to 3GB per hour depending on quality.\n\nIf you find yourself running low, Thai Simcard allows for easy top-ups, so you are never left without a connection in the middle of a trip through Thailand or other parts of Asia. You can see plans for all available data increments.\n\n## The Bottom Line\n\nKeeping your Australian number overseas doesn't have to be expensive. By switching to a long-expiry prepaid plan and utilizing the Dual-SIM capabilities of your smartphone with a Thai Simcard eSIM, you get the best of both worlds: the security of your home number for SMS and banking, and the affordability of local data rates. This strategy saves you from the 'roaming tax' charged by big telcos and ensures you have the high-speed 5G connectivity needed to navigate, book rides, and stay in touch with the world while you explore.