What is an eSIM, and does my phone support one?
An eSIM is a SIM card that is already inside your phone. Instead of putting in a plastic card, you scan a QR code and the phone downloads the details. Most phones sold since about 2020 support it, and you can check in under a minute by dialling a code. It is mainly useful for travel - a local data plan without hunting for a shop - and for keeping a second number on one phone. What it is not is a way to receive verification SMS cheaply, which is the commonest reason people look it up and the commonest disappointment.
Check your phone in one minute
- Dial *#06#The phone shows its identifiers. If an EID appears alongside the IMEI, the phone has eSIM hardware. No EID means no eSIM.
- Or look in the settingsOn Android: Network and internet, then SIMs, and look for an option to add an eSIM or download a SIM. On iPhone: Mobile Service, then Add eSIM.
- Check the phone is unlockedA phone locked to one operator will refuse another operator eSIM. This is separate from having the hardware, and it is the thing people discover last.
What it is good for
- Travel data. Buy a plan for where you are going, activate it on landing, and skip the airport shop and the roaming bill.
- A second number without losing your first. Work and personal on one phone, both live at once.
- Switching without a shop. Changing plan is a download rather than a delivery.
- A phone with no SIM tray at all. Some recent models have no slot, so eSIM is the only option.
What it is not for
An eSIM is a full mobile subscription, priced accordingly. If all you need is a six-digit code to finish a sign-up, a rented virtual number costs a fraction of the price, arrives in seconds and needs no compatible phone at all. Buying a travel eSIM to verify one account is spending several dollars on something a fraction of that would have done.
It also does not change your phone number. Adding an eSIM adds a line; it does not move your existing number onto it. Moving a number is a transfer arranged with your operator, and it is a different process.
Before you buy one
- Confirm the EID exists, using the dial code above.
- Confirm the phone is not carrier-locked.
- Check the plan covers the country you are actually going to, not the region name.
- Keep the QR code. Many eSIMs can only be installed once, and reinstalling after a factory reset needs the original.
Common questions
Does an eSIM work without wifi?
You need a connection to download it the first time - wifi or another working data line. Install it before you travel rather than on arrival, when you may have neither.
Can I use an eSIM and a physical SIM together?
On most phones that support eSIM, yes. Both lines are active and you choose which one makes calls or carries data. That is what makes it useful for keeping a second number.
Is an eSIM cheaper than roaming?
For data, usually by a wide margin, because you are buying a local plan instead of paying your home operator for the same data. For calls it depends on the plan, and some cheap travel eSIMs are data-only with no number at all.
Can I receive SMS verification codes on an eSIM?
Only if the plan includes a phone number - many travel data plans do not. If receiving codes is the whole purpose, a rented virtual number is the cheaper and more reliable answer, and it works on any phone.