Travel guide
Can I Use an eSIM and Physical SIM at the Same Time?
Can I use an eSIM and physical SIM at the same time? Yes on most modern phones. Here is how dual SIM works abroad and how to avoid surprise roaming bills.
Can you use an eSIM and a physical SIM at the same time? Yes, on most phones made in the last few years. This is called dual SIM: your usual SIM stays in the tray, the eSIM is added as a second line, and you pick which one handles mobile data.
In short:
- Dual SIM means two lines active on one phone, one physical and one eSIM.
- Both lines can make and receive calls, but only one line uses mobile data at a time.
- For travel, keep your home SIM for your number and use the eSIM for data.
- Set the data line yourself and keep data roaming off on the home line.
What dual SIM actually means
A physical SIM is the small card you slide into a tray. An eSIM is a built-in chip that holds a downloaded profile instead. Phones with both can hold a physical SIM and one or more eSIM profiles, and the phone treats each as a separate line.
Using an eSIM and a physical SIM at the same time is therefore a normal, supported setup. It is how people keep a work and a personal number on one phone, and it is the easiest way to travel without giving up your own number.
The catch is that having two lines active does not mean getting double the data. Your phone sends mobile data through one line at a time, and that is the setting that matters most abroad.
Which phones can do it
On iPhone, Apple says that if your iPhone has a SIM tray, you can use both a physical SIM and an eSIM while travelling internationally. Apple’s travel eSIM guide lists iPhone XS, XS Max, XR or later. Your iPhone must also be unlocked, which you can check under Settings › General › About, where “No SIM Restrictions” should appear next to Network Provider Lock.
Many Android phones support dual SIM too, though the details vary by maker and model. If you can add an eSIM under Settings › Network & internet › SIMs, your phone is eSIM-capable. Whether it can keep a physical SIM active alongside it depends on the model, so check your phone’s manual or settings.
If you are not sure, our eSIM-compatible phones page is the quickest place to confirm before you buy.
Using a travel eSIM and your home SIM together
This is the most useful dual SIM setup for a trip. Your home SIM keeps your number, so banking codes, calls and WhatsApp verification still reach you. The travel eSIM handles mobile data in the country you are visiting.
Roamy plans are data-only. They have no phone number, calls or SMS, so nothing about your own number changes. If you want to go deeper on that, see our guide on keeping your WhatsApp number with a travel eSIM.
Before you leave, it is worth a quick test at home: turn Wi-Fi off, select the travel line for mobile data and try loading a page. If everything is set up correctly, nothing loads, because the eSIM only connects in your destination country. The real goal is to confirm your home line is not using data. Depending on your plan, you can also watch your usage in your carrier’s app.
A typical split looks like this:
| Home SIM | Travel eSIM | |
|---|---|---|
| Role | Your number, calls and texts | Mobile data |
| Mobile data | Off | On |
| Data roaming | Off | On |
| Label | “Home” | “Travel” |
How to set it up on iPhone
Install the eSIM at home on Wi-Fi first. With iOS 17.4 or later, the Roamy app can install it in one tap. Otherwise you can use a QR code or enter the details manually.
- Go to Settings › Mobile Service (or Cellular) and check both lines are listed.
- Label them clearly, for example “Home” and “Travel”.
- Go to Mobile Data and select the travel line as the data line.
- Open the settings for your home line and switch Data Roaming off.
- Open the travel line and switch Data Roaming on, which a travel eSIM needs because it uses partner networks abroad.
The mobile data switching setting
Apple notes that only one number uses mobile data at a time, and you change it under Settings › Mobile Data. There is also an option called Allow Mobile Data Switching, which lets data move between your two numbers depending on coverage. Apple says it does not work while data roaming is on, but it is simplest to switch it off for travel so your phone cannot quietly lean on the wrong line. See Apple’s page on using Dual SIM for the full description.
How to set it up on Android
Menu names differ between brands, but the idea is the same.
- Add the eSIM under Settings › Network & internet › SIMs and give it a clear name.
- In the same SIMs menu, choose the eSIM as your Mobile data SIM.
- Turn data roaming on for the eSIM and off for your home SIM.
- Leave calls and texts on your home SIM if you want to keep using your own number.
Google’s eSIM setup help shows the standard way to add one on a Pixel.
How to avoid roaming charges when using both SIMs
The one real risk with dual SIM abroad is your phone using the wrong line for data. A few habits remove it.
- Pick the data line yourself. Do not leave it on automatic. Choose the travel eSIM.
- Keep data roaming off on your home line. That stops your home carrier billing you for data abroad.
- Remember calls and texts. Your home line can still receive them, and your carrier may charge for that depending on your plan. Check with them before you go.
- Use apps for messaging and calls. WhatsApp and similar apps run over the travel eSIM’s data, so you rarely need the home line for anything abroad.
Apple also suggests checking whether your carrier includes international roaming on some plans without extra fees, so it is worth a quick look at your own tariff.
For the wider picture on costs, our comparison of eSIM, roaming and local SIM cards walks through the options.
Common dual SIM problems
Data still runs through my home line
Open your mobile data settings and confirm the travel line is selected. Then check that data roaming is off for the home line. Restarting the phone after changing these settings can also help.
My travel eSIM shows “No service”
An eSIM only connects on supported networks at your destination, so at home it will show no service or stay inactive. Roamy’s validity starts on first connection abroad, not when you install it. If it still will not connect after you land, try toggling airplane mode and see our help centre.
Battery drains faster
Two active lines mean the phone looks for two networks. If you do not need to receive calls on the home line, you can switch it off for the trip, though you will then miss calls and texts to that number.
Get connected with Roamy
Roamy eSIMs are data-only, so your usual SIM keeps your number and your travel eSIM does the mobile data. Install at home, label the lines, set the eSIM as your data line, and you are ready to land online. Browse plans for 172 countries on our eSIM page, with prices from $14.00 for global coverage.
Frequently asked questions
Can I use an eSIM and a physical SIM at the same time?
Yes, on most recent phones. Your physical SIM stays in the tray and the eSIM sits alongside it. Both lines can be on, and you choose which one carries mobile data.
Can both SIMs use mobile data at once?
No. Only one line uses mobile data at a time. For travel, set the eSIM as your data line and leave data roaming off on your home line.
Will I keep my own phone number with a Roamy eSIM?
Yes. Roamy plans are data-only, so they have no number, calls or SMS. Your usual SIM keeps your number for calls and texts.
Do I need to take my physical SIM out?
No. Leave it in the tray. If you want to avoid any roaming charges from your home carrier, keep data roaming off on that line.
What if my phone only has one SIM slot and no eSIM?
Then you cannot run two lines at once. Check at /esim-compatible-phones before you buy, because a travel eSIM needs an unlocked, eSIM-compatible phone.
