What is an eSIM and how does it work in 2025?

An eSIM is an embedded SIM card - a function built directly into most modern phones. Once downloaded and activated, it lets you access alternative mobile data plans from a provider without needing a physical SIM card. It's the perfect alternative to expensive Australian telco "pay per day" international roaming plans. Let’s walk through everything you need to know about eSIMs.

What is an eSIM card?

An eSIM is a virtual SIM card that is software-based rather than hardware-based. It connects to a mobile network, supports internet roaming, and allows you to make calls and send texts on any plan you choose.

Unlike a traditional SIM card, eSIMs don’t require any physical swapping. Instead, they’re accessible remotely, making them incredibly convenient for Aussie travellers and those who frequently switch networks.

Key things to know:

Not all phones are eSIM compatible: you’ll need to check if your device supports eSIM functionality.
Some devices allow you to store multiple profiles. Depending on your phone, you can store up to eight profiles on an eSIM.
It works through a microchip installed on your device. The main difference between an eSIM and a SIM card is that the eSIM is virtual and not tied to any provider.

How does an eSIM Work?

An eSIM integrates into your device’s hardware, eliminating the need for a physical card. You can switch service carriers or plans by using an app, scanning a QR code, or accessing your device’s settings. This convenient and flexible solution is especially useful for travelers, as it removes the hassle of carrying or switching physical SIM cards.

eSIM vs. SIM cards

Here’s a quick comparison of eSIMs versus SIM cards:

Feature	eSIM	SIM Card
Availability	Increasingly available across most modern devices.	Still the most common option globally.
Convenience	Highly convenient; activate and switch plans remotely through software.	Requires manual insertion or swapping to change plans.
Security	More secure since the data is embedded, eliminating physical tampering.	Standard security; can be tampered with, removed, or lost.

What Can You Do With an eSIM?

An eSIM provides flexibility and features ideal for Australian travellers or those needing multiple data plans. With an eSIM, you can:

Access data roaming
Provide network authentication
Activate mobile plans remotely
Store multiple profiles

Benefits of eSIMs

Lower roaming charges while traveling
Secure information storage in the Cloud
Convenient purchasing from online stores
Easy activation and switching between data plans
Environmentally friendly by reducing the need for physical SIM cards and plastic waste
Supports multiple phone numbers, allowing you to have both personal and work profiles on one device

Disadvantages of eSIMs

Device compatibility: Not all phones support eSIM functionality, especially older models.
Limited features with some eSIMs: Some eSIMs don’t include phone calls or text messaging; these features depend on the carrier.

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What are the best eSIM carriers and providers in 2025?

Many carriers now offer eSIMs. Here’s a quick look at some popular options:

Carrier	Region	Main Features
Woolworths Mobile	Australia	Offers eSIM support on select plans, primarily for domestic use.
Vodafone	Europe	Offers eSIM service on Apple and Android devices.
Verizon	Global	Provides a wide variety of data packages and roaming services.
T-Mobile	North America, Global	Offers an app and roaming services for travellers.
Telstra	Australia, Global	Offers eSIM support for compatible devices and international roaming plans.
Orange	Europe, Global	Compatible with many devices and includes roaming services.
Optus	Australia, Global	Provides eSIM compatibility and a range of international roaming options.
O2	Europe, Global	Provides different data plans for travellers and locals.
Holafly	Global	Focuses on eSIMs for travel, with data plans for specific regions and countries.
AussieRoam	Global	Aussie-based provider offering eSIMs with competitive data plans for travellers.
AT&T	North America, Global	Supports eSIMs for Android, iOS, and other devices.
amaysim	Australia	Provides eSIM compatibility for a range of devices and plans.
Airalo	Global	Specialises in eSIMs for travel, offering data plans for various countries.

Which Phones Are eSIM Compatible?

Most iPhones and many recent Android devices support eSIMs. Check your phone’s settings to see if it’s compatible.

Some compatible models include:

iPhones: iPhone 11–iPhone 16, iPhone XR, iPhone XS
Androids: Huawei P40, Samsung Galaxy S20–S24, Google Pixel 3–8

Are eSIMs Compatible With Other Devices?

Yes! eSIMs are compatible with more than just phones:

Laptops: Many newer laptops support eSIM functionality.
Smartwatches: Many smartwatches use eSIMs, though they may drain battery life quickly due to their small size.

How to Set Up an eSIM

Setting up an eSIM is straightforward:

Check Compatibility: Ensure your phone supports eSIM technology.
Get an Activation Code: Use a QR code from your provider to capture the configuration.
Open Device Settings: Choose whether you want to use the eSIM for calls and data or only data.
Activate the eSIM: You're ready to connect to a cellular network!

Can You Transfer a SIM to an eSIM?

Yes, it’s possible to transfer a physical SIM to an eSIM. Some companies send a QR code for activation, while others may require in-store visits.

Wrapping Up eSIMs for 2025

eSIM technology is revolutionizing mobile connectivity. It’s more convenient, cost-effective, and environmentally friendly than traditional SIM cards. With more devices supporting eSIM and major carriers adopting this technology, eSIMs are becoming the future of mobile data.

The question is: are you ready to join the eSIM revolution?