What is an eSIM? How does it work?
Everything you need to know about the digital SIM card technology. No more plastic cards, just instant connectivity.
What is eSIM?
An eSIM is an embedded Subscriber Identity Module—essentially, a built-in chip inside your phone. It has all the functions of a traditional SIM card, but without the need to insert a small card into your phone. Plus, eSIM allows you to use services from multiple carriers and multiple phone numbers simultaneously, which is very convenient.
Smartphones, tablets, smartwatches, and even some cars are equipped with eSIM! This feature is perfect for quickly switching phone numbers while also getting mobile data for your travels.
Instant Digital Delivery
Get your data plan immediately via email or app. No shipping, no waiting.
Easy Global Access
Download plans for over 150+ countries. Stay connected wherever you go.
Secure & Flexible
Cannot be physically lost or stolen. Store multiple profiles on one device.
How does eSIM work?
eSIM works using software pre-installed on your device, functioning just like a physical SIM card. Once you activate it, you can connect to mobile networks, make calls, and use mobile data. Most modern smartphones have built-in eSIM functionality, but please check our eSIM compatible device list to ensure your phone can use this feature.
To get started with eSIM, simply purchase an eSIM plan and complete the quick setup. There's no need to remove your current SIM card—you can leave it in place whether you decide to continue using it or not.
How to set up eSIM
Follow these steps to start using eSIM on iPhone or Android.
Set up eSIM on your iPhone using the AirZlink app
Choose an eSIM data plan for your trip
Select the country/region you are traveling to and pick a plan.
Download AirZlink eSIM app
Get the app, tap "Install eSIM", then follow the on-screen instructions.
Your plan will automatically activate
Get ready for your trip, the plan will activate when you arrive.
Manually set up eSIM on iPhone
- Go to "Settings".
- Tap "Mobile Data" or "Cellular".
- Tap "Add Data Plan".
- Tap "Enter Details Manually" at the bottom of the screen.
- Paste the eSIM information shared by the provider.
eSIM Pros
eSIM is the future of connectivity. Here are the main advantages of eSIM.
No expensive roaming fees
Travelers can buy an eSIM, connect to a local carrier, and avoid unexpected roaming charges.
Multiple profiles
You can install multiple virtual eSIMs on one device, making it easy to switch between carriers and phone numbers.
Pay as you go
Going to Japan for a week? Buy a 7-day plan without paying for a whole month, saving money for more sushi.
Space saving
Without a physical SIM slot, space is freed up for other device upgrades (like bigger batteries or more phone features).
Can't be lost or stolen
Swapping tiny SIM cards is a hassle, especially when traveling. eSIM is "built-in", so it can't be lost or stolen.
Less waste
One plastic SIM card won't destroy the planet, but a new packaged SIM card for every trip adds up. Switch to eSIM.
What is the difference between eSIM and Physical SIM?
The main difference is that eSIM is a digital chip, while a SIM card is a physical chip.
*AirZlink currently only supports mobile data, so we do not support phone numbers yet. Don't worry—we are working on improving it.