For years, staying connected abroad has been a real headache: between buying a local SIM card and the exorbitant roaming fees imposed by operators, it was difficult to find a satisfactory solution… until now. eSIMs, already on the market for several years, are finally getting all the attention they deserve.
Wondering how these famous eSIMs work? Good news: you’ve come to the right place! Discover everything you need to know about this small technological revolution, capable of simplifying your travels and allowing you to stay connected wherever you are.
What are eSIMs and why are they important?
Almost all phones need a SIM card to access the mobile network and make calls. Usually, you have to slide this small plastic chip into a tray (or even remove the back cover if you have an older model). You know the routine: it quickly becomes tedious when you’re juggling multiple phones or SIM cards.
Fortunately, the eSIM changes the game. Integrated directly into the smartphone’s motherboard, this tiny chip does everything a physical SIM card does… without any manipulation. Today, many modern devices already offer eSIM in addition to the usual SIM tray.
eSIMs offer real advantages compared to traditional SIM cards.
- Firstly, you can store multiple data plans simultaneously, without being limited to a single subscription.
- Their ultra-compact format frees up space in your smartphone, allowing manufacturers to strengthen other essential components… like the battery!
- You no longer have to handle hardware parts: no more laborious disassembly or searching for a paperclip to eject a tray!
Learn more about how eSIMs work, the digital equivalent of a traditional SIM card

We are often asked if the eSIM works exactly like a physical SIM… and the answer is simple: YES!
All eSIM-compatible smartphones offer an option in their settings to add a cellular plan (here are the instructions dedicated to iPhones).
On the Vostra platform, activating a data plan takes only a few seconds: you can install the eSIM by scanning a QR code, manually entering the information, or directly via the app. You then immediately have a volume of mobile data valid for the duration of your choice.
Key takeaway:
With this data plan completely independent of your usual operator, say goodbye to exorbitant international fees! And don’t worry, you’ll still keep your phone number, of course. The Vostra eSIM instantly connects you to local networks in over 200 countries, providing you with ultra-fast data access like never before.
With Vostra, renew or change your eSIM data plan anytime and set up a new one in less than five minutes. No contract is required!
Is the Dual SIM function identical to the eSIM function?
Not necessarily!
The term « Dual SIM » simply means that a smartphone can accommodate multiple SIM cards. However, this doesn’t necessarily mean that one of these cards is an eSIM. In reality, many « Dual SIM » phones offer two physical SIM card slots, clearly visible on their dedicated tray.
Conversely, some more advanced models allow for combining a SIM card and an eSIM, or even using two eSIMs together, while still retaining the « Dual SIM » designation.
Where can (and can’t) you use an eSIM?

eSIM data plans covering over 200 countries and regions are available on the Vostra platform! This technology is already adopted by most major European operators, as well as in international hubs such as Canada, Hong Kong, India, Qatar, Singapore, Taiwan, and the United States. In other words, wherever you go, you are very likely to find a suitable eSIM plan.
Prefer to stay with your current operator? Most also offer an eSIM option, which simply replaces your physical SIM card. However, depending on the case, you may need to contact customer service or visit a store, which can slightly extend the waiting time.
Adventure has no limits, and thanks to Vostra, neither does your mobile data
You now know more about how eSIMs work, these digitized SIM cards integrated directly into your phone. They are impossible to lose, and you can store several at once. The result: you enjoy almost immediate access to local plans anywhere in the world.
It’s the ideal solution for frequent travelers, and it’s rapidly gaining popularity. Ready to make the switch? Explore Vostra’s eSIM plans now!
FAQ
What is an eSIM and how does it differ from a physical SIM card?
An eSIM is a digital SIM card integrated directly into your device, unlike a removable physical SIM card. It allows you to connect to a mobile network without having to insert a physical card.
Which devices are compatible with eSIMs?
Many recent devices, including smartphones, tablets, and connected devices, support eSIMs. It is recommended to check with your device manufacturer or consult the list of compatible devices to confirm this feature.
What are the benefits of using an eSIM for international travel?
By using an eSIM when you travel, you don’t have to bear high roaming charges. You can subscribe to local plans at advantageous rates, change plans without physical manipulation, and even store multiple eSIM profiles on the same device.
How do I install and activate an eSIM on my device?
eSIM installation and activation vary depending on the device, but generally:
- You purchase an eSIM plan from a provider such as Vostra.
- You receive a QR code or installation instructions.
- You access your device settings and add a new mobile plan.
- You scan the QR code or manually enter the provided information.
- You activate the plan once installed.
Can I use an eSIM and a physical SIM card simultaneously on my device?
Yes, many eSIM-compatible devices allow for the simultaneous use of an eSIM and a physical SIM card, thus offering dual SIM functionality. This allows you to manage two distinct numbers or plans on the same device.
How can I top up my eSIM plan if I run out of data?
With providers like Vostra, you can easily top up your eSIM plan via their app or website. Simply select the appropriate top-up option for your current plan.
Do eSIMs work in all countries?
eSIMs are functional in many countries, but availability and compatibility may vary depending on regions and local operators. It is advisable to check the coverage and available offers for your destination before traveling.
Is it possible to transfer my eSIM to another device?
eSIMs are generally linked to a single device and cannot be transferred directly. If you change devices, you will likely need to obtain a new eSIM or reactivate your plan on the new device, taking into account your provider’s policies.


