What is an eSIM?
An eSIM is a digital SIM that lets you install a mobile plan on a compatible device without inserting a physical card. You typically add a plan through an app or QR code, then select it for mobile data in your phone’s settings. If you’re interested in the inner workings of this tech, our guide to what an eSIM is covers the technical details in more detail.
eSIM vs. physical SIM: The core trade-off
Both options give you affordable mobile data, so choosing between an eSIM and a physical SIM really just depends on your phone and how you want to get connected.
Difference | An eSIM | A physical SIM |
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Setup speed | You can set up your eSIM before departure, usually with an internet connection. | You need to obtain the card and insert it. Registration may also be required. |
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Flexibility across borders | You can add destination plans digitally or choose a regional plan. | A regional plan can cover several countries, but changing providers may mean replacing the card. |
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Availability | Your phone must support an eSIM and be unlocked to use another provider.
| Physical cards fit more older phones, although some newer models have no SIM tray. |
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Dual-SIM support | Compatible phones can keep your home line on alongside a travel data plan. | Using two physical cards requires a phone with two suitable SIM slots. |
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Is an eSIM better than a physical SIM? For travel, yes, as long as your phone supports one. You set up data before you go and get to keep your home SIM in your phone. Price and signal strength come down to the plan and network you choose, so the format won’t make your connection more reliable or faster. But if your phone doesn’t support eSIMs, a physical SIM is your only option. For a more in-depth look at switching phones, setup, and cost, see our full eSIM vs. physical SIM comparison.
The pros of using an eSIM (and why it’s worth it)
An eSIM saves you time before you leave and eliminates the hassle once you arrive. Here are the benefits of an eSIM that matter most when you travel:
Airport SIM queues are off the itinerary. Buy and install your eSIM at home, then head straight for the exit after landing.
Your home SIM stays installed. Forget digging out an ejector tool or finding somewhere safe for a card smaller than a fingernail — eSIMs can be used alongside physical SIMs on most phones.
Your home number stays active. On a dual-SIM phone, the eSIM handles mobile data while the regular line still receives calls and texts. Check your carrier’s rates, though — calls made or taken abroad and texts sent can cost extra.
Data kicks in soon after landing. A plan set up in advance connects once your phone finds a partner network.
Multi-country trips get easier. One regional plan can cover several countries, and adding a new destination in the app takes a few minutes.
An eSIM is harder to lose or misuse. It can’t fall out of your phone, and a thief can’t pop it out to use in another device.
Some providers add useful extras. The Saily eSIM app includes an ad blocker that can stretch your data by stopping ads from loading, plus 24/7 live chat support if setup trips you up.
Quick setup. Embedded SIM technology allows for very quick installation and activation. You can get connected in just a few minutes, whether through guided in-app steps (as with Saily) or via a QR code.
Ultimately, an eSIM takes the stress out of staying connected, giving you more time to actually enjoy your trip.
Are eSIMs safe?
If you’re hoping for a short answer, there really isn’t one — but overall, eSIMs are incredibly safe. They are physically more secure than traditional cards because a thief can’t pop them out to use in another device. A protected chip also stores your credentials, meaning eSIMs are much harder to clone than physical SIMs.
While the hardware is highly secure, you should still watch out for common account scams:
Phishing links: Scammers may text you to “verify” your eSIM plan via a fake link. Always open your provider’s app directly instead.
SIM swapping: A fraudster could pose as you and ask your home carrier to move your number to their SIM. Protect yourself by adding a carrier PIN.
Public Wi-Fi: Cellular data is generally secure, but using a VPN with your eSIM enhances security while traveling and protects you on sketchy hotel networks.
To learn which precautions matter most, read our eSIM safety guide.
What are the downsides of using an eSIM?
The biggest eSIM disadvantage can stop you before checkout: Your phone may not support one. The others are trade-offs you can plan around once you know them:
Not every phone supports eSIM technology. While most recent Apple iPhones and Google Pixel phones support it, older and budget models often lack the necessary hardware. Additionally, a carrier-locked phone can’t use another provider’s plan. Look up your model in our list of eSIM-compatible devices before buying.
Most travel eSIMs are data-only. WhatsApp, FaceTime, and personal hotspots work perfectly over mobile data, but a local number for regular calls and SMS usually isn’t part of most eSIM packages. Booking a restaurant that only takes phone reservations may mean asking your hotel for help.
First-time setup has a small learning curve. Installation takes a few minutes, but the eSIM also needs to be set as your mobile data line with data roaming turned on for it within your cellular settings. Leaving roaming off on your home line keeps your carrier’s charges out of the picture.
Switching phones takes extra steps. Unlike a card, an eSIM can’t be popped out and moved to a new device. Depending on the provider, the transfer happens in your phone’s settings or through customer support.
Human error can cause hiccups. Because there is no physical card to hold on to, you have to be careful in your settings. If you aren’t paying attention to the on-screen instructions, it is possible to accidentally delete your eSIM profile.
Phone compatibility is the only downside on that list that serves as a true deal-breaker. The other trade-offs come down to picking the right plan and spending a few minutes adjusting your device.
One thing you don’t have to stress over, though, is your signal strength. A lot of first-time eSIM users wonder if going digital means a weaker connection. The answer is a hard no. The SIM, embedded or physical, only tells the network which plan you’re on. The phone’s antenna and modem pick up the signal, so an eSIM and a physical SIM on the same network and in the same spot get the same reception. When the connection crawls despite full bars, the network or the plan is usually the cause. The local network may be congested, or an unlimited plan may have used up its daily high-speed allowance.
eSIM vs. international roaming: Which saves you more?
Let’s look at a typical example — a daily roaming pass from one of the biggest US carriers. These passes typically cost around US$12. Saily offers small prepaid mobile data plans starting at US$1.99, which can cover light use over a short trip. If you mainly need directions and messaging apps, buying a data package can cost considerably less than paying for roaming each day.
A daily pass may include calls and texts as well as a larger data allowance, so the cheapest eSIM package isn’t an equivalent replacement. But those extras only justify the price if you need them.
Roaming can be the better deal when your home plan already includes enough data at your destination for little or no extra charge. In that case, buying a travel eSIM could mean paying for data you already have.
The eSIM vs. roaming decision comes down to the total cost for your trip and what’s included. A prepaid Saily plan lets you choose your data allowance and see the price before buying. Compare that with your carrier’s daily passes or longer-term add-ons — our international roaming guide explains how those charges work.
How much does an eSIM cost — and is it worth the price?
With an eSIM, staying connected in a new country doesn’t have to be a guessing game like it is with many major US carriers. The price of an eSIM usually comes down to three simple things: your specific destination, your data allowance, and the length of your trip. For example, Saily’s plans for Japan offer a lot of flexibility: a 1 GB eSIM plan starts as low as US$3.99 for seven days, while 30 days of unlimited data goes for US$71.99.
On a short trip, a small eSIM plan can cost less than one day on a carrier’s daily roaming pass and it’s often cheaper than an airport tourist SIM, too. However, if you’re staying over a month, getting a local prepaid SIM might become a more practical option. It gives you a local phone number, and many local carriers offer their own eSIMs now as well.
Of course, trip length is only half the equation. The other half is your appetite for data. Unlimited plans are incredibly tempting if you hate tracking every megabyte or topping up mid-trip. They’re absolutely worth the price if your phone doubles as your office, or if you’re venturing into remote areas where you can’t rely on hotel or cafe Wi-Fi. Hotspotting to your laptop or making daily video calls will chew through a fixed data plan in days. On the flip side, if you only need data for quick map checks and WhatsApp messages between Wi-Fi sessions, a fixed plan will easily cover your needs for a lot less money.
Just make sure to check the fair-use terms before you pay extra for an unlimited eSIM plan. Most providers give you a daily allowance of high-speed data, then slow your connection until it resets the next day. Saily's unlimited plans for Japan, for instance, give you 5 GB of full-speed data per day before throttling to 1 Mbps. That speed is still perfectly fine for messaging and navigation, though streaming Full HD video might buffer. Once you know your trip length and how much data you use, compare Saily eSIM plans and pricing by destination to find the right plan.
When is an eSIM actually worth it?
A weekend in Prague and three months in Lisbon call for very different mobile plans. For most international travel, an eSIM is worth it on these kinds of trips:
Short trips and city breaks. A small prepaid plan covers a few days of maps and messaging, often for less than a single day on a carrier’s roaming pass. If your home carrier charges a typical US$10 to US$12 daily fee for international roaming, switching to an eSIM for a four- to seven-day trip can easily save you US$40 to US$80 in fees alone.
Multi-country itineraries. One regional plan can cover every stop, as long as each country appears on its coverage list.
First visits. Mobile data on arrival lets you reach your accommodation without hunting for a SIM counter in an unfamiliar airport.
Trips where you need your home number to stay active. A dual-SIM phone allows for the travel eSIM to work alongside your regular SIM, so your contacts can reach you via calls and texts.
For a long stay in one country, a local prepaid plan usually gets you more data for less money, plus a local number. And if your home plan already includes enough roaming data at your destination, a travel eSIM won’t save you much. Price is only part of the picture, though. Saily’s built-in ad blocker can save about 28.6% of your data on average, and web protection helps block known harmful websites while you browse.
Two Saily plan types also cover trips that a single local SIM can’t. Saily’s cruise plans allow you to go online where regular land-based plans don’t work. With a shared plan, one person buys a single data package and splits it with up to four travel companions. So if your trip involves a cruise, a group, or a lot of browsing on the go, an eSIM can be worth it for the features alone.
Why choose Saily?
If your home carrier loves charging ridiculous daily roaming fees, and the idea of wandering an unfamiliar airport to find a SIM counter sounds exhausting, Saily has your back. The app lets you sort out your data from your couch before you even start packing. Setup is handled right in the app, with 24/7 live chat support if you need help, and built-in security features for safer browsing — practical extras among the many features that set Saily apart
Ready to give an eSIM a try? Download the Saily eSIM app and choose a data plan for your next trip!
