iPhone Dual SIM With eSIM: The Complete Setup Guide
iPhone dual SIM lets one iPhone run two phone lines at once — usually a physical nano-SIM paired with an eSIM, or two eSIMs on newer models — so your home number stays active for calls while a second line, like a travel data eSIM, handles data abroad. Apple builds this in natively, right in Settings, with no case, adapter, or jailbreak required.
This guide walks through the exact setup process on iPhone, how to label and prioritize your two lines, and which iPhone models can run two eSIMs at once.
What Is iPhone Dual SIM, Exactly?
Apple actually has two related but different features, and the naming trips people up:
- Dual SIM with eSIM — one physical nano-SIM plus one eSIM active together. This is what most iPhone owners use: a home SIM for their regular number, and an eSIM added for travel, a second number, or a separate data plan.
- Dual eSIM — two eSIMs active at the same time, no physical SIM involved. This matters most on models sold without a SIM tray at all.
Both let the iPhone receive calls and texts on either line and choose which one handles data. If you want the general mechanics of how any dual-SIM phone (not just iPhone) handles two active lines, see our eSIM and dual SIM explainer — that piece covers the concept across devices; this guide is specifically about iPhone's Settings app, its menus, and its iPhone-only quirks.
Which iPhones Support iPhone Dual SIM?
Physical SIM + eSIM together has been supported since the iPhone XS, XS Max, and XR (2018), and every eSIM-capable model since. The one common exception: iPhones sold in mainland China have historically used two physical nano-SIM slots instead of an eSIM slot, so dual SIM works differently there. Check our full eSIM-compatible iPhone list if you're unsure about a specific model or region.
Two eSIMs running at once (Dual eSIM) arrived later, starting with the iPhone 13 lineup, and continues through the iPhone 14, 15, and 16 series, provided both of your carriers support it. This became especially relevant with US models of the iPhone 14 and later, which shipped without a physical SIM tray at all — on those phones, every line is an eSIM, so "dual SIM" effectively means dual eSIM from the start.
A quick way to confirm your own phone: go to Settings > Cellular. If you see an option to "Add eSIM" or "Add Cellular Plan," your device supports adding at least a second line.
How to Set Up Dual SIM With eSIM on iPhone
- Open Settings and tap Cellular (labeled "Mobile Data" in some regions).
- Tap Add eSIM (sometimes shown as "Add Cellular Plan").
- Choose Use QR Code, then scan the QR code from your eSIM provider — for a travel plan like Simnity's, this is the QR code emailed after purchase. If you're activating from the same device the QR was sent to, use "Enter Details Manually" instead.
- Wait for the plan to install and activate — this typically takes a few seconds to a couple of minutes on Wi-Fi.
- When prompted, label the line (e.g., "Simnity Travel" or "Home") so the two lines are easy to tell apart later.
- Choose your default line settings, covered next.
If the QR code won't scan, try increasing screen brightness, printing or enlarging the code, or switching to manual entry. If you get a "plan cannot be added" message, restarting the iPhone and re-scanning is usually the fastest fix before contacting support.
Choosing Default Voice, Data, and iMessage Lines
Once both lines are active, iOS asks you to set priorities. You can revisit all of these later in Settings > Cellular:
| Setting | Where to find it | What it controls |
|---|---|---|
| Default Voice Line | Settings > Cellular > Default Voice Line | Which line makes outgoing calls by default |
| Cellular Data | Settings > Cellular > Cellular Data | Which line is used for internet data |
| Allow Cellular Data Switching | Below Cellular Data | Lets iOS fall back to the other line if your primary data line has no signal |
| iMessage & FaceTime | Settings > Messages / Settings > FaceTime | Which number sends/receives iMessages and FaceTime calls |
| Data Roaming (per line) | Tap each line under Cellular | Whether that specific line uses data on a foreign network |
For most travelers, the goal is simple: keep your home SIM for calls and your existing number, and make the new eSIM your primary data line while abroad.
Recommended Travel Setup
| Line | Voice calls | Cellular data | Data roaming |
|---|---|---|---|
| Home physical SIM | Keep as default | Turn off (avoids roaming charges) | Off |
| Travel eSIM (e.g. Simnity) | Off / backup only | On, set as primary | On |
Turning off cellular data on your home SIM is the single most important step — it stops surprise roaming bills, since incoming calls and texts still work over your home line even with its data switched off.
How Many eSIMs Can Your iPhone Hold?
You can typically store several eSIM plans on one iPhone — useful if you keep eSIMs from past trips or different providers — even though only two lines total can be active for calls, texts, and data at any moment (one in use, one on standby). Exact storage limits vary by model and iOS version, so check our breakdown on how many eSIMs a phone can have for specifics on your device.
A Note on Data-Only eSIMs
Most travel eSIMs, including Simnity's, are data-only — they give you mobile internet abroad without issuing a new phone number, which is exactly why pairing one with your existing physical SIM works so well: your number and calls stay on your home line, and the eSIM just handles data. If you're weighing a physical SIM swap, an international roaming add-on, or a data-only eSIM for an upcoming trip, Simnity sells prepaid travel data eSIMs with QR code activation, so you can get the second line above set up before you land.
FAQ
Can I use dual SIM on any iPhone? Only iPhone models from the XS/XS Max/XR (2018) onward support adding an eSIM alongside a physical SIM. Older iPhones and some region-specific models (notably certain mainland China units) don't support eSIM at all. Check Settings > Cellular for an "Add eSIM" option to confirm.
Do I need to remove my physical SIM to add an eSIM? No. Dual SIM with eSIM means both stay in the phone at once — your nano-SIM tray stays exactly as it is, and the eSIM is added digitally alongside it.
Which iPhones can run two eSIMs at the same time with no physical SIM? Support for two simultaneously active eSIMs started with the iPhone 13 lineup and continues through later series, and it's the standard setup on US models of the iPhone 14 and newer, which don't have a physical SIM tray.
Will my data automatically switch between my two lines while traveling? Only if you enable "Allow Cellular Data Switching" in Settings > Cellular. Otherwise, whichever line you've set as the default Cellular Data line is the one used until you change it manually.
Can I keep my home number and still get data abroad with an eSIM? Yes — this is the most common dual SIM setup. Keep your physical home SIM active for calls and texts, with its data turned off, and set a data-only travel eSIM as your primary data line.
Frequently Asked Questions
Can I use dual SIM on any iPhone?
Only iPhone models from the XS/XS Max/XR (2018) onward support adding an eSIM alongside a physical SIM. Older iPhones and some region-specific models (notably certain mainland China units) don't support eSIM at all. Check Settings > Cellular for an "Add eSIM" option to confirm.
Do I need to remove my physical SIM to add an eSIM?
No. Dual SIM with eSIM means both stay in the phone at once — your nano-SIM tray stays exactly as it is, and the eSIM is added digitally alongside it.
Which iPhones can run two eSIMs at the same time with no physical SIM?
Support for two simultaneously active eSIMs started with the iPhone 13 lineup and continues through later series, and it's the standard setup on US models of the iPhone 14 and newer, which don't have a physical SIM tray.
Will my data automatically switch between my two lines while traveling?
Only if you enable "Allow Cellular Data Switching" in Settings > Cellular. Otherwise, whichever line you've set as the default Cellular Data line is the one used until you change it manually.
Can I keep my home number and still get data abroad with an eSIM?
Yes — this is the most common dual SIM setup. Keep your physical home SIM active for calls and texts, with its data turned off, and set a data-only travel eSIM as your primary data line.