Quick answer: An eSIM is a digital SIM built into your phone, so you don’t need a plastic SIM card. Your carrier sends your mobile plan to the phone over the internet, and you can store several plans on one device and switch between them. Most recent iPhones, Pixels and Samsung Galaxy phones support it.
The eSIM has gone from niche feature to the default in many places. Some new iPhones sold in certain markets no longer have a SIM tray at all. If you’re buying a new phone, travelling abroad, or just tired of fiddling with SIM ejector pins, it helps to know how eSIM works and where it can trip you up.
What is an eSIM and how does it work?
A traditional SIM card is a small chip that holds your subscriber identity: the details your carrier uses to know which number and plan belong to you. An eSIM moves that identity onto a chip permanently built into the phone.
The GSMA, the mobile industry body behind the standard, describes eSIM as a global specification that “enables remote SIM provisioning of any mobile device”. In plain English, your carrier can send your plan to your phone digitally instead of posting you a card. The GSMA says eSIM keeps “an equivalent level of security” to a removable SIM.
You can store several operator profiles on a device and switch between them, though the GSMA notes only one profile is active at a time on a single eSIM chip. Many phones combine an eSIM with a physical SIM slot, or support two active eSIMs, so you can run two numbers at once.
What are the pros and cons of eSIM?
Advantages
- No card to lose or damage. There’s nothing to fall out or get bent.
- Faster setup. You can often activate a new plan from home without visiting a store.
- Several plans on one phone. Apple says an iPhone can hold eight or more eSIMs.
- Easier travel. You can add a local or travel data plan before you land.
- Harder to steal. A thief can’t simply pop out your SIM and put it in another phone.
Drawbacks
- Swapping phones takes a few more steps. You can’t just move a card; you transfer the eSIM through your phone’s settings or your carrier.
- Carrier processes vary. Some carriers make conversion quick in an app; others need a store visit or a verification call.
- Repairs and resets need care. Erasing a phone can remove an eSIM, so check before you factory-reset.
Does my phone support eSIM?
Most flagship and many mid-range phones sold in recent years do. Indian carrier Airtel, for example, lists iPhones from the XS onwards plus Google Pixel, Samsung, Motorola, Vivo, OPPO and OnePlus phones among compatible brands, though support varies by individual model.
To check yours:
- iPhone: go to Settings > Mobile Service (or Cellular) and look for an option to add an eSIM.
- Android: go to Settings > Network & internet (or Connections) > SIMs and look for an option to download or add an eSIM.
- Any phone: dial *#06#. If you see an EID number, your phone has an eSIM chip.
Some newer iPhones sold in specific regions are eSIM-only. Apple’s support page, for example, says certain recent models in China mainland, including the iPhone 18 Pro and Pro Max, support only eSIM. Check the specs for your country before you buy.
How do I switch from a physical SIM to an eSIM?
The exact steps depend on your carrier, but the process usually looks like this:
- Back up your phone and make sure you’re on Wi-Fi.
- Find your EID by dialling *#06# or checking your phone’s About settings. Many carriers ask for this.
- Request the conversion through your carrier’s app, website or store.
- Verify your identity. Expect an OTP, and sometimes a confirmation call.
- Install the eSIM profile by scanning a QR code, tapping a notification or following in-app prompts.
- Wait for activation and make a test call before you throw away the old SIM.
Example: Airtel in India
Airtel’s eSIM page describes the process as: open the Airtel app, go to the “Upgrade to eSIM” shortcut, enter your 32-digit EID, confirm the OTP, take a verification call within 10 minutes, then download the profile. Airtel says activation happens within two hours of downloading it. Jio and Vi offer eSIM too, so check your carrier’s official app or website for current steps.
Moving an eSIM to a new iPhone
Apple’s eSIM Quick Transfer lets you move your number between iPhones without calling your carrier, as long as both phones run iOS 18.4 or later, are near each other with Bluetooth on, and use the same Apple Account, according to Apple Support. Your carrier needs to support it.
Can I use an eSIM when I travel?
Yes, and this is one of its best uses. You can add a travel data eSIM from a local carrier or an international eSIM provider while keeping your home number active for calls and OTP texts. Before you buy, check three things:
- Your phone is carrier-free, meaning it isn’t locked to one network.
- The plan covers all the countries on your trip.
- You know how to set the travel eSIM as your data line and turn off data roaming on your home line to avoid surprise charges.
Install the travel eSIM before you leave while you still have reliable Wi-Fi, but only switch it on when you land if the plan’s validity starts at activation.
For more explainers, visit our Tech News section. Once your plan is sorted, our guide to RCS messaging explains why your texts may look different.
Frequently asked questions
Is an eSIM safer than a physical SIM?
It’s at least as secure, according to the GSMA, and it’s harder for a thief to remove. SIM-swap fraud can still happen if someone convinces your carrier to move your number, so protect your carrier account with a strong PIN or password.
Can I use an eSIM and a physical SIM at the same time?
On most dual-SIM phones, yes. You can run one physical SIM and one eSIM, or on many newer phones two eSIMs.
What happens to my eSIM if I lose my phone?
Contact your carrier to block the line and issue a new eSIM to your replacement phone. Because there’s no card to remove, a thief can’t use your number in another phone.
Does converting to eSIM change my number or plan?
No. Your number, plan and balance stay the same. Only the way your phone stores your SIM details changes.