What Is an eSIM Card and How Do You Set One Up?
An eSIM is a digital SIM card built into your phone. It activates over Wi-Fi in minutes. No plastic card, no SIM swap, no roaming fees.
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What Is an eSIM Card? eSIM Explained
What is a eSIM? An eSIM is a digital SIM card built into your phone that gives you instant mobile data in 185+ countries without swapping a physical card. Unlike the removable nano SIM you pick up at a Singtel or StarHub shop, the embedded chip is soldered onto your phone's motherboard and stores carrier profiles in software. Also written as e SIM or e-sim, it connects you to cellular networks for calls, SMS, and mobile data with nothing to insert, lose, or hunt for at Changi Airport Arrivals. What is cellular data? It is the 4G LTE or 5G connection your phone uses for internet, navigation, and apps, the same technology a physical SIM card uses but now connecting you to local networks overseas at local rates.
The GSMA, the industry body that manages the SGP.22 eSIM standard, defines how phones store and switch carrier profiles wirelessly. Also called a virtual SIM or digital SIM card because the entire profile lives in software, the technology is now built into most phones sold in Singapore from 2018 onwards. Compatible models include iPhones (XS through iPhone 16), Samsung Galaxy devices (S20 through Galaxy S25), and Google Pixels (3 through Pixel 9). All five Singapore carriers, Singtel, StarHub, M1, GOMO, and TPG, support eSIM for local plans. HelloRoam, built by FutureSyncs Ltd (Companies House 15950168), adds travel profiles on top, so Singapore travellers skip roaming charges from the moment they land.
What is an eSIM?
An eSIM is a built-in digital SIM that lets you activate a mobile plan without using a physical SIM card.
How to get an eSIM
- Check device compatibility
- Choose an eSIM plan
- Purchase online
- Scan QR code or install manually
- Activate in settings
How Does an eSIM Work? (iPhone and Android Setup)
An eSIM works by downloading and storing a carrier profile inside your phone's built-in chip. Once active, it connects you to mobile networks for calls, texts, and mobile data, the same as a physical SIM card. What is data on a mobile phone? It is the cellular internet your phone uses for maps, Grab, messaging, and browsing, delivered through a local carrier profile. Singtel, StarHub, M1, GOMO, and TPG all support eSIM on Singapore home plans. For travel, HelloRoam loads a separate local-rate profile on the same chip. On iPhone, go to Settings, Cellular, Add eSIM. On Android, go to Settings, Network, SIM manager. Most phones released after 2018 include the embedded chip. You can check our compatibility list if you are unsure about your model.
Setup takes about 5 minutes. Buy a HelloRoam plan online, open your confirmation email, and scan the QR code. Your physical Singtel, StarHub, or M1 SIM stays in place the whole time. Both lines run in dual SIM mode at once. Your Singapore SIM keeps your home number active so friends and family can reach you, while the HelloRoam eSIM handles data at local rates in Japan, Korea, Thailand, Malaysia, or Australia. Set up before you leave for Changi and your data is ready the moment you land. What is eSIM on iPhone? On models from XS and newer: Settings, Cellular, Add eSIM, then scan the QR code. You can store multiple profiles and switch between them in Settings at any time.
How Do You Set Up an eSIM?
Follow these steps to get started using an eSIM on your iPhone or Android.
Set up an eSIM on your iPhone with HelloRoam
Pick your plan and check out
Choose a data plan for your destination and complete payment online or through the HelloRoam app.
Scan the QR code
Open the confirmation email on your phone and scan the QR code with your camera to install the eSIM.
Land and connect
Your plan installs immediately. It activates when you arrive at your destination country.
Set up an eSIM on Android with HelloRoam
Pick your plan and check out
Choose a data plan for your destination and complete payment online or through the HelloRoam app.
Scan the QR code
Open the confirmation email on your phone and scan the QR code with your camera to install the eSIM.
Land and connect
Your plan installs immediately. It activates when you arrive at your destination country.
Set up your eSIM using a QR code from HelloRoam
Scan QR to download HelloRoam
Scan the QR code with your phone to download HelloRoam from the App Store or Google Play.
Pick a plan for your trip
Choose a data plan for your destination and complete payment in the app.
Plan activates on arrival
Your plan installs before you depart and activates when your phone detects the local network at your destination.
Why eSIM Matters in 2026
Mobile connectivity has changed fast, and eSIM sits at the center of that shift. The reasons are practical, not just technical.
Travelers today expect:
- Instant connectivity upon arrival
- Real savings on every trip
- No dependency on local stores or kiosks
- Switch between countries instantly
Traditional SIM cards struggle to meet these expectations. eSIM solves these problems by making connectivity digital-first.
Smartphone makers are also removing physical SIM trays from newer models, a sign the industry is shifting toward eSIM-only devices.
Cut up to 84% off
roaming costs
HelloRoam plans start at S$1.32. No contracts and no hidden charges. An eSIM you never activate can be refunded within 180 days.(Source: HelloRoam pricing analysis, 2026)
Browse PlansNot sure if your phone supports eSIM?
Not all phones support eSIM, but most modern smartphones do.
However, compatibility can vary based on region and carrier restrictions. Always check your specific model before purchasing a plan.
Why this matters:
eSIM is a hardware feature. If your device doesn't support it, you won't be able to use an eSIM from any provider.
eSIM benefits for international travel
Avoid roaming fees
Singtel ReadyRoam, StarHub DataTravel, and M1 Data Passport each charge around SGD 10 per day the moment you land overseas. A HelloRoam e SIM connects you directly to local networks at flat prepaid rates, so that daily fee never appears on your bill.
Activates instantly
Buy a plan, scan a QR code, and you are online in minutes. No queues, no hunting for a SIM counter at Narita, Suvarnabhumi, or Incheon Airport.
Keep primary number active
Your phone stores multiple eSIM profiles at once. Fly from Kuala Lumpur to Tokyo to Seoul and switch networks in Settings without touching a physical card.
Multi-country coverage
HelloRoam connects you to 212+ mobile networks across 185+ countries. Japan, South Korea, Australia, Thailand, and Malaysia are all covered.
Quick switching
No lock-in, no monthly fees. Pick the plan that fits your trip length and data needs. Nothing to cancel when you land back at Changi.
Backup connectivity
Bag taken at a night market or phone left on the MRT? Your eSIM stays soldered to the circuit board. Nobody can pull it out or steal it.
Common Use Cases for eSIM
Travel
The top reason people get one: cheap, instant mobile data overseas.
Business
Professionals can maintain multiple numbers or plans without juggling devices.
Remote Work
Steady internet across borders, with no need to hunt for Wi-Fi.
eSIM Limitations to Know Before You Buy
While eSIM offers many advantages, it's important to understand its limitations:
- Requires a compatible deviceOlder phones and budget models sold in Singapore may still need a physical SIM. Samsung A-series budget phones often lack the embedded chip. Singtel, StarHub, and M1 retail staff can confirm compatibility, but the fastest check is the HelloRoam compatibility tool before you buy a plan.
- Some older networks may not fully support itSome smaller carriers in ASEAN destinations have not yet added eSIM support. This is more common in rural areas of Vietnam, Myanmar, and Cambodia than in major cities. HelloRoam always shows the partner networks available at your destination before you buy.
- Initial setup may feel unfamiliar to first-time usersYou need a Wi-Fi or mobile data connection to download the eSIM profile. Set up at home on your Singtel or StarHub broadband before you head to Changi. The download takes under 2 minutes. If you miss this step, Jewel Changi and all three Changi terminals have free Wi-Fi to complete setup before boarding.
- Transferring eSIM between devices can require extra stepsMoving an eSIM profile to a new phone takes more steps than handing a physical SIM card to Singtel or M1 staff for a SIM swap. You cannot physically pull the chip out and put it in another device. Contact HelloRoam support via WhatsApp and our team will issue a replacement plan for your new device.
These limitations are shrinking as adoption grows, but they are
still worth considering.
These limits shrink as more phones and carriers adopt eSIM, but keep them in mind.
eSIM security and future technology
eSIM technology is designed for both convenience and long-term mobile innovation. From stronger security protections to growing worldwide adoption, eSIM is shaping how travelers and connected devices stay online.
Supported by leading brands including Apple, Samsung, and Google.
eSIM vs SIM Card: Which Is Better for International Travel?
An eSIM is generally better than a physical SIM card for international travel because it activates instantly, costs less than roaming, and allows you to switch networks without changing hardware. Travelers benefit from faster setup, greater flexibility, and lower overall costs.
Common eSIM Problems and Fixes
Running into a problem? Our 24/7 support team handles these issues every day for Singapore travellers. Here are quick fixes for the most common eSIM setup problems, from QR codes that will not scan at home to data that does not connect after clearing immigration at Narita, Incheon, or Suvarnabhumi.
- 1
- 1Clean your camera lens and hold your phone 15 to 30 cm from the QR code in good light.
- 2If it still fails, tap 'Enter Details Manually' and type the SM-DP+ address and activation code from your HelloRoam email.
- 3This works on Singtel-locked iPhones and carrier-unlocked Samsung Galaxy devices sold in Singapore.
Does your phone say the code is no longer valid? The eSIM may already be on your device. Check your list of mobile lines before you scan again. - 2
- 1Restart your phone first.
- 2Open Settings and confirm the HelloRoam eSIM line is selected for cellular data and that Data Roaming is on for that line.
- 3Make sure Data Roaming on your Singtel, StarHub, or M1 SIM is turned off so it is not competing for priority.
- 4If you bought an auto-activation plan, the eSIM connects only after your phone detects the destination network at the foreign airport.
Fix 2 of 6 · Recorded on iPhone · 0:10
Set the HelloRoam line for mobile data, under Mobile Data inside Mobile Service. - 3
- 1Open Settings and check your list of mobile lines first.
- 2The HelloRoam line can show up under another name, such as Secondary.
- 3If you find it switched off, tap it and turn the line on.
- 4If it is not in the list, the install did not finish, so read the error message on screen.
- 5Confirm your device supports eSIM and is not carrier-locked by Singtel, StarHub, or M1.
- 6Don't delete an eSIM to try to fix this: email help@helloroam.com with your order number and the error message.
- 4
- 1Go to Settings, then Cellular or Mobile Data, and select the eSIM profile you want to delete.
- 2Tap 'Remove Cellular Plan' or 'Delete eSIM'.
- 3If the option is greyed out, the plan is still active.
- 4Deactivate it first, then delete.
- 5On Samsung Galaxy devices sold in Singapore, this is under Settings, Connections, SIM Manager.
- 5
- 1Most phones store several eSIM profiles but only one handles data at a time.
- 2Go to Settings, then Cellular, and choose which line handles mobile data.
- 3Assign your Singtel or StarHub line for calls and texts, and assign HelloRoam for data.
- 4Turn off any profile you are not currently using to stop conflicts.
- 6
- 1Check that you typed the activation code exactly as shown in your HelloRoam email, including dashes and special characters.
- 2Connect to stable Wi-Fi, such as your home broadband or Changi Airport free Wi-Fi, and try again.
- 3If the code still fails, message HelloRoam support on WhatsApp or live chat and we will issue a replacement code.
Still stuck? Our support team is here 24/7 on email, WhatsApp, live chat, and in the app.
“eSIM technology is the biggest shift in mobile connectivity since the smartphone. Travelers no longer need to choose between staying connected and overpaying.”
Popular eSIM Destinations
Frequently Asked eSIM Questions
You activate an eSIM yourself in about 5 minutes without visiting any shop or counter. Purchase a HelloRoam plan online or in the app, then open your confirmation email. On iPhone: go to Settings, Cellular, Add eSIM, and scan the QR code from your email. On Android: go to Settings, Network, SIM manager, tap Add, and scan the QR code. Your phone downloads the carrier profile over Wi-Fi. Once installed, the eSIM activates automatically when your phone detects the destination network. Set up at home before heading to Changi to avoid any delays on arrival.
Singtel, StarHub, and M1 all support embedded SIM on their home Singapore plans. For international travel data, HelloRoam connects you to local partner networks in 185+ countries at flat prepaid rates, lower than what Singapore carriers charge for overseas roaming. What is data roaming? It is when your Singapore SIM connects to a foreign network, typically at SGD 8 to SGD 27 per day. A HelloRoam e-sim plan avoids that entirely by giving you a local-rate profile for each destination.
Yes, an eSIM works for day trips to Johor Bahru (JB). Malaysia is fully covered by HelloRoam. Buy a short-duration plan before you drive or take the bus across the Causeway. Your eSIM activates the moment your phone connects to a Malaysian network. Keep your Singapore SIM active for calls back home, while your HelloRoam e-sim handles data in JB at local rates. The same applies for Batam and Bintan day trips: both are covered by HelloRoam plans for Indonesia.
No, you do not need to buy a local SIM card at Changi Airport when you have a HelloRoam eSIM. Buy a plan online before you fly, scan the QR code to install it, and your phone connects to the destination network the moment you land. Skip the SIM counter queue at Changi Arrivals entirely. HelloRoam covers 185+ countries, including Japan, South Korea, Thailand, Australia, and Malaysia, so one account handles all your trips.
Yes, HelloRoam supports hotspot and tethering on most compatible phones. Turn on Personal Hotspot in your phone Settings and share your travel data with a laptop, tablet, or family member's phone. Hotspot usage drains data faster than browsing on your phone alone. Streaming or downloading over a hotspot can use 1 to 2GB per hour. If you plan to share data during your trip, pick a larger data plan or an unlimited option to avoid running out mid-journey.
HelloRoam eSIM covers Japan and South Korea fully. Both are among the most popular destinations for Singapore travellers. Japan plans connect to leading local networks such as NTT docomo and KDDI (au) on 4G LTE and 5G across Tokyo, Osaka, Kyoto, and Hokkaido. South Korea plans run on SK Telecom and LG Uplus in Seoul, Busan, and Jeju. Buy both plans before your flight from Changi and switch between them in Settings when you cross the border or fly between the two countries.
A tourist SIM card from a local shop gives you a physical card, sometimes at similar data rates, but requires queuing at an airport counter or telco store, ID verification, and collecting a card. A HelloRoam e-sim requires none of that. You buy online in minutes, scan a QR code, and the plan installs on your phone before you leave home. There is no card to insert, no activation counter, and no plastic to discard afterwards. For frequent flyers from Singapore, the fuss-free digital option is the better fit.
Yes, you keep your Singapore number when you use a HelloRoam travel eSIM. HelloRoam travel plans are data-only and do not assign a new phone number. Your Singtel, StarHub, or M1 SIM stays active in your physical SIM slot, handling calls and texts on your regular Singapore number. The HelloRoam eSIM line runs alongside it, handling mobile data at local rates abroad. For voice calls over data, use WhatsApp, FaceTime, or Zoom on your HelloRoam data connection.
HelloRoam covers 185+ countries, including the most popular destinations for Singapore travellers: Japan, South Korea, Thailand, Australia, the United Kingdom, the United States, and Malaysia. ASEAN destinations including Indonesia, Vietnam, the Philippines, and Cambodia are also covered. You can browse all countries on the HelloRoam app or website before purchasing. Plans start at S$1.32 with no contracts.
Yes. A HelloRoam eSIM data plan works through your phone's normal hotspot or personal-hotspot setting, the same as a physical SIM. Turn on the hotspot in your phone settings, connect your laptop or a second device over Wi-Fi, and it draws from the same data plan. Sharing a fixed data plan across devices uses it up faster. Check your remaining balance in the HelloRoam app if you plan to hotspot for more than a quick task.
Yes. Adding an eSIM does not disable your physical SIM slot. Most eSIM phones, including every iPhone from the XS (2018) onward, run both at once in dual SIM mode. Your physical SIM can keep handling calls and texts on your home number. Your HelloRoam eSIM handles data on the local network at your destination.
Consumer eSIM technology dates to 2016, when the GSMA published SGP.22, the remote provisioning standard phones still use. Apple brought eSIM to the iPhone with the XS in 2018, and Samsung and Google flagships followed. Most flagship phones now ship with an eUICC chip built in, though some budget models still skip it. HelloRoam uses that same SGP.22 standard to deliver travel plans.
Sources
- GSMA eSIM Specification (SGP.22)(Accessed April 2026)
- ITU-T Recommendation E.118 — International Telecommunication Charge Card(Accessed April 2026)
- Apple — About eSIM(Accessed April 2026)