eSIM FAQ

eSIM Hub give answers to some of our eSIM quick fire questions we get asked in 2025. Ever wanted to know a bit more about eSIM technology? eSIM Hub breakdown easy to read yet comprehensive answers to some of our most asked eSIM questions in 2025.

Are eSIMs good for travel?

Yes, eSIMs are generally considered very good for travel due to several key advantages:  

• Avoid Roaming Fees: eSIMs allow you to easily purchase and activate local data plans in your destination country. They are often at significantly lower rates than your home carrier’s international roaming charges.  
• Convenience: No more fumbling with physical SIM cards that can be easily lost or damaged. You can purchase and activate an eSIM online before or upon arrival.  
• Flexibility: Many devices allow you to store multiple eSIM profiles. This enables you to switch between different local plans or keep your home number active for calls and texts.  
• Easy Activation: Activation usually involves scanning a QR code provided by the eSIM vendor or using their dedicated app, a quick and straightforward process.  
• Staying Connected Instantly: Upon arrival, you can quickly activate your travel eSIM and have internet access without needing to find a local SIM card vendor.  
• Security: As eSIMs are embedded in your device, they cannot be physically removed if your phone is lost or stolen, potentially offering a slight security advantage over physical SIMs.  

While some older or budget devices may not support eSIM, and data-only eSIMs might not include local calls and SMS, the benefits for staying connected affordably and conveniently while traveling make eSIMs an increasingly popular choice. Several providers like Airalo, Holafly, and Nomad specialize in travel eSIM plans for numerous countries.   Sources and related content

What is the eSIM?

An eSIM, or embedded SIM, is a digital SIM card built directly into your device, eliminating the need for physical plastic. It functions identically to a traditional SIM, identifying your device and connecting you to a mobile network. eSIMs can store multiple carrier profiles, allowing you to switch between providers without swapping physical cards. Activation typically involves scanning a QR code or using a provider’s app, offering greater convenience and flexibility, especially for travelers and managing multiple phone numbers on a single device. Read our ‘What is an eSIM’ page.

What is the downside of eSIM?

One potential downside of eSIM is the slightly more complex process of transferring your number to a new phone if your old device is broken or inaccessible, as it requires network intervention rather than simply moving a physical card. Additionally, not all older phone models support eSIM, and carrier compatibility can vary. For users who frequently switch devices, the digital nature might feel less tangible than a physical SIM. However, these limitations are gradually being addressed with evolving technology and wider adoption.

What is the best eSIM for Australia?

The “best” eSIM for Australia depends on your specific needs. For tourists, providers like Airalo, Holafly, and local options like Optus and Vodafone offer competitive short-term data plans. For residents, Telstra, Optus, and Vodafone all offer eSIM options alongside their traditional plans, with varying coverage and pricing. Consider your data requirements, duration of stay (if a visitor), and desired network coverage when making your choice. Comparing plans from different providers is essential to find the best fit.

Does an eSIM change your phone number?

No, an eSIM itself does not change your phone number. It is simply a digital format for your mobile service. When you activate an eSIM with a mobile carrier, you are essentially downloading the profile associated with your existing or new phone number onto the embedded chip in your device. Switching between eSIM profiles allows you to use different phone numbers on the same device, but the eSIM technology itself is independent of the phone number assigned by your chosen carrier.

Which carrier has eSIM in Australia?

The major mobile carriers in Australia – Telstra, Optus, and Vodafone – all offer eSIM support for compatible devices. Smaller Mobile Virtual Network Operators (MVNOs) operating on these networks are also increasingly providing eSIM options. Availability can vary depending on the specific MVNO and plan. It’s advisable to check directly with your preferred carrier or MVNO to confirm their eSIM offerings and compatibility with your device.

Why are eSIMs banned in China?

eSIMs are not entirely banned in China, but their use is significantly restricted, particularly for smartphones. The primary reasons cited often revolve around government control and security concerns. Physical SIM cards provide a more direct link between a user and their registered identity, making tracking and monitoring easier for authorities. The reprogrammable nature of eSIMs is perceived by some as potentially circumventing these controls. However, eSIMs are used in China for certain IoT devices and wearables under specific regulations.

What is the risk with eSIM?

One potential risk associated with eSIM is the possibility of “eSIM swapping” fraud. This involves a malicious actor tricking your mobile provider into transferring your eSIM profile to their device, potentially gaining access to your calls, messages, and accounts linked to your phone number. Implementing strong security measures like multi-factor authentication on your mobile account and being vigilant about phishing attempts can help mitigate this risk. Carriers are also continuously working on enhancing eSIM security protocols.

Can I convert my physical SIM to an eSIM?

Yes, in most cases, you can convert your existing physical SIM card to an eSIM if your device supports eSIM functionality and your mobile carrier offers this service. The process typically involves contacting your carrier through their app, website, or customer service, and following their instructions, which may include verifying your identity. Once the conversion is complete, your physical SIM will usually be deactivated, and your mobile profile will reside on your device’s embedded eSIM.

Does eSIM use more battery?

Generally, eSIM itself does not inherently use significantly more battery than a physical SIM card. The power consumption is primarily related to your device’s cellular connection and usage patterns, regardless of whether you are using a physical SIM or an eSIM. Having multiple eSIM profiles stored on your device doesn’t continuously drain the battery. However, actively using multiple cellular connections simultaneously (if your device allows) will naturally consume more power.

Do I get a phone number with eSIM?

Yes, you absolutely get a phone number when you activate an eSIM with a mobile carrier. The eSIM is simply the digital medium that holds your mobile service information. This includes your phone number, plan details, and network access credentials. The process of obtaining a phone number is separate from the eSIM technology itself. You receive a phone number from your chosen carrier when you subscribe to their services. Then you activate it on your eSIM.

Does Telstra do eSIM?

Yes, Telstra is one of the major mobile carriers in Australia that offers eSIM support. This applies to a wide range of compatible smartphones, wearables, and tablets. Customers can activate new services on an eSIM or convert their existing physical Telstra SIM to an eSIM. You can find more information at the Telstra website.

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