Does switching to an eSIM change your phone number? Complete guide
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Does an eSIM change your number? This question is as old as the technology itself, and in short, in most situations, it doesn't. Whether you switch from a physical card to an eSIM or add an additional eSIM for travel data, your number stays the same.
Many people mix up eSIMs with phone numbers, but they're not actually the same thing. An eSIM (embedded SIM) is a digital version of a physical SIM card. So, it's the technology, not the number itself. Your phone number, on the other hand, comes from your mobile carrier and is associated with your account, not to the SIM itself.
To explain how eSIMs work, the Cybernews research team and I looked into how they affect your phone number, calls, SMS, and WhatsApp. I also cover what you need to do to avoid roaming charges when traveling.
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Do you keep your phone number with an eSIM? The short answer
Yes, you can usually keep your phone number when you make the switch from a physical SIM to an eSIM, since it’s linked to your mobile plan, not the type of SIM you use. So, as long as you transfer your existing plan from a physical SIM to an eSIM, your number won’t change.
That said, adding an additional eSIM works slightly differently. So, does an eSIM change your phone number? It depends on the eSIM itself. When you get a secondary eSIM, you’re usually adding a separate mobile plan. That means you keep your regular number active on your main line, while the secondary eSIM stays separate.
Some eSIMs come with a separate phone number, but many travel-focused ones are data-only. In both cases, eSIMs don’t affect your primary number.
When your number stays the same
There are two main scenarios where you can keep your old number:
- Switching from a physical SIM card to an eSIM while staying with your current carrier doesn’t affect your existing number
- If you transfer your existing number to a new carrier (number porting) and switch to an eSIM at the same time, you can also keep your number
When your number might not stay the same
If you upgrade your existing plan by adding a new voice line, your number will change, as you’re essentially creating a new number for that line. The same applies if you get an entirely new mobile plan from a different provider without porting your old one.
Notably, most modern eSIMs don’t come with a traditional phone number anymore and are data-only. So, if you install, for example, Nomad eSIM – be it for its affordable data or for its support for countries you plan to visit – you can get data for your trip abroad and keep your original number active on your main line.
How dual-SIM helps you keep your primary number active
Many modern smartphones let you use two lines at the same time, which is also known as dual-SIM capability. While the name might imply two physical SIMs, you’re not exactly limited to just that. Sure, you can use that setup, but you can also have two eSIMs active at the same time or combine a physical SIM and an eSIM.
This technology has made traveling much easier, since you no longer have to worry about whether your main line will stay active on an international trip. It essentially lets you keep your physical SIM (or primary eSIM) while simultaneously adding a secondary eSIM for data, so important calls and texts can still go through if your primary line stays active.
And the best part? After adding an eSIM, you just need to open your phone’s settings and choose which SIM handles calls and which one data.
Real-world example
Say you’re a US citizen traveling to Japan. You can keep your physical SIM or primary eSIM in your phone and leave it as the default for calls and texts, and add a secondary travel eSIM for affordable data when you land.
This keeps your phone number active for verification messages or emergency calls. Meanwhile, the eSIM provides data for everything from maps and messaging apps like WhatsApp to accommodation booking sites and ride-hailing.
Calls, SMS, WhatsApp, and staying reachable abroad
As a traveler, you may pose one important question – can I keep my phone number with an eSIM? As you now know, the answer is yes. As long as it remains active, which depends on whether your carrier allows it in that region and if roaming is enabled, you can still call or text from your phone number.
However, if you want to avoid expensive mobile carrier data charges, I recommend switching to a secondary eSIM for all your internet-based messaging apps, like WhatsApp. Although it’s tied to the number you registered your account with, you can keep using it with an eSIM and avoid high roaming charges.
That applies to Nomad travel eSIM packages as well, which offer affordable international data plans, allowing you to use WhatsApp or any other communication apps that require an active internet connection. That’s how most travelers set things up: they stay fully reachable by keeping their existing phone number active with their primary SIM (or eSIM), while the secondary eSIM supplies data for WhatsApp, iMessage, ride-hailing, accommodation, maps, and other apps.
Of course, staying reachable when traveling isn’t free. At this point, you’re outside of the area your carrier covers natively, which means it'll bill you extra if you send regular text messages or answer and receive calls while abroad. These are covered by roaming charges, and they can be painfully expensive if you’re not careful.
How to avoid roaming charges while keeping your number
While roaming can be costly, especially if your plan doesn’t include international minutes or data, you can avoid these charges. The most common strategy is to keep the primary line active for important calls and texts only while routing data to your eSIM. If set up correctly, this helps you avoid using expensive mobile carrier’s data.
Setting up an eSIM is also quite straightforward: just head to your device’s settings, look for roaming options, and turn it off on your main line. From there, make sure the same line is selected as the default for calls and SMS, and then set your eSIM as the data source.
Avoiding high roaming charges is one of the most common reasons travelers choose Nomad eSIM. It offers flexible and affordable international data plans that are often cheaper than standard home carrier roaming rates. And you get to keep your phone number active for emergencies while using Nomad eSIM.
Why Nomad eSIM can be useful if you want data abroad without changing your main number
Nomad eSIM offers affordable mobile data while traveling without affecting your existing phone number. It stays active for emergencies, and you get plenty of data for your travels. Plan options cater to different data needs, trip lengths and multi-country itineraries, giving you the flexibility to choose the best package based on your travel needs.
Nomad eSIM data can be used for a wide range of activities, from running Google or Apple Maps while you explore a new city to hailing rides and booking accommodation if you don’t plan to stay in the same place for the entire vacation. Even if you do things that require a lot of data, like watching YouTube or Netflix, Nomad eSIM might still offer better prices than your home carrier.
Conclusion
So, does an eSIM change your number? As we’ve established, switching to an eSIM doesn’t affect your primary line on its own. In most cases, such as when you’re transitioning from a physical SIM card to an eSIM, porting your number to a new carrier, or installing a secondary travel eSIM, you get to keep your main phone number and every function that comes with it.
The only situations in which your main number is affected include getting a new mobile plan with a different carrier without porting your old number and adding a new line to your existing account, which comes with its own number. How you configure your phone also matters – your SIMs should be set to handle calls and data accordingly.
With the right setup, you never have to lose your phone’s main functions like calls and SMS, even when you travel. And with Nomad eSIM’s travel plans, you get to keep your main phone number active and get plenty of affordable data on any trip.
FAQ
Does an eSIM change your phone number?
No, an eSIM doesn’t affect your number. An eSIM is essentially the digital version of a physical SIM card that connects your phone number to your carrier account. Your number stays tied to this account, not to whether the SIM is physical or digital.
Do I keep my phone number with an eSIM?
Yes, you can keep your number with an eSIM in most cases. Your main line stays the same when you switch from a physical SIM to an eSIM, change carriers, or add a secondary eSIM for travel data. However, adding a new line to an existing plan or getting an entirely new plan from a different carrier can affect your phone number.
Can I use my normal number and an eSIM at the same time?
Yes, if you have a dual-SIM device, you can use your main line and an eSIM at the same time. In most cases, this works whether your primary phone number is on a physical SIM card or you already have an active eSIM.
Can I still get texts on my original number while using an eSIM?
Yes, you can still send and receive SMS messages, as long as your main line remains active. This can be especially useful for various apps you might need on your trip, since many require verification codes you can only get via text.
Does WhatsApp change when I install an eSIM?
No, your WhatsApp account is associated with the phone number you used during registration, not the SIM card format. So, moving from a physical SIM to an eSIM or adding a secondary eSIM for data while traveling shouldn’t affect WhatsApp’s functionality in any way.
Can I avoid roaming charges with an eSIM?
Yes, you can. By adding a travel eSIM like Nomad eSIM and setting it up as your main data SIM in the phone’s settings, you can avoid the exorbitant roaming prices carriers often charge travelers. Keep in mind that SMS and calls can still incur roaming charges.
