Dual SIM lets you keep your home number active for calls and texts while a travel eSIM handles data. HelloRoam (8.8/10, 31/31 activations, 185+ countries) scored highest in our dual-SIM testing with instant QR delivery and 24/7 support. Set your physical SIM as the default for calls and your travel eSIM as the default for mobile data in Settings > Cellular. This setup works on iPhone 12 and later, Samsung Galaxy S20 and later, and Google Pixel 6 and later.
What Dual SIM Means for Travelers
Dual SIM means your phone runs two cellular lines at the same time. In a travel context, this is usually your home physical SIM plus a travel eSIM. Your home number stays active and receives calls normally. The travel eSIM handles all data at local rates, which are typically 70 to 95 percent cheaper than your home carrier's international roaming rates.
The key point is that your phone splits the two functions: voice calls go through your home SIM line and data goes through the travel eSIM. You never need to tell callers a temporary number or forward calls to a second phone. Anyone who has your home number can reach you exactly as they would at home.
Keep your home number
Incoming calls and texts arrive on your home SIM as normal. No call forwarding setup required.
Local data rates
Your travel eSIM connects to local networks at local prices. A 5GB eSIM for Europe costs $8 to $20 versus $5 per day from most US carriers.
Switch in settings
Toggle which SIM handles data or calls in your phone settings anytime. No SIM swap, no carrier call required.
iPhone Dual SIM Setup: Step by Step
This process works on iPhone XS and later. iPhone 14 and later in the US use two eSIMs instead of a physical SIM plus eSIM, but the steps are identical. Allow 10 to 15 minutes and complete this setup before you leave home.
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Check that your iPhone supports dual SIM
iPhone XS, XR, and all later models support dual SIM. In the US, iPhone 14 and later are eSIM-only with no physical SIM slot, so your second line must be an eSIM. Go to Settings > General > About and check your model. You can also dial *#06# -- if an EID appears alongside your IMEI, your phone has an eSIM chip.
- 2
Purchase and receive your travel eSIM QR code
Buy an eSIM plan from your chosen provider. You receive a QR code by email or inside the provider's app within minutes of purchase. Do this before you leave home. You need a working Wi-Fi connection to activate the eSIM, and your home network is the most reliable option.
- 3
Add the eSIM via Settings > Cellular > Add eSIM
Open Settings and tap Cellular. Tap "Add eSIM" at the top of the screen. On iOS 16 or earlier, this option appears as "Add Cellular Plan". Point your camera at the QR code from your provider and hold it steady until your phone reads the code. If the camera does not work, tap "Enter Details Manually" and type in the activation code.
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Label your two lines clearly
iOS asks you to name each line after the eSIM downloads. Use names you will immediately recognize, such as "Home" and "Travel Europe" or the carrier name. These labels appear in the status bar and in every call or message screen. A clear label prevents you from calling from the wrong line.
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Set your travel eSIM as the cellular data line
Go to Settings > Cellular > Cellular Data. Select your travel eSIM as the data line. This is the step most people skip. Without it, your phone continues using your home SIM for data, which triggers full roaming charges. Tap "Switch Anyway" if iOS warns you about switching lines.
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Set your home SIM for calls and test before you depart
In Settings > Cellular, set "Default Voice Line" to your home SIM. This keeps your home number active for incoming and outgoing calls. Make a test call and load a webpage to confirm each function routes through the correct line. Fix any issues now, not at the airport.
iPhones purchased in mainland China do not support eSIM and cannot run dual SIM with this method. If you have a Chinese market iPhone, you need two physical SIM cards using the dual physical SIM tray on those models.
Android Dual SIM Setup: Samsung and Pixel
Samsung Galaxy S20 and later support eSIM in most markets. Google Pixel 4 and later support eSIM across all variants. Other Android brands (OnePlus, Motorola, Sony) have eSIM on select models -- check your specific device spec sheet.
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Open SIM Manager (Samsung)
On Samsung Galaxy phones, go to Settings > Connections > SIM Manager. You see your physical SIM listed on slot 1. Tap "Add eSIM" or the plus icon to start the eSIM download process. Samsung calls this "Add mobile plan" on some devices running One UI 5 or earlier.
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Open SIMs settings (Google Pixel)
On Pixel phones, go to Settings > Network and Internet > SIMs. Tap the plus icon or "Add SIM". Pixel 7 and later can store two active eSIMs simultaneously without a physical SIM. Older Pixels support one eSIM plus one physical SIM.
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Scan the QR code or enter the activation code
Android displays a camera screen to scan your eSIM QR code. Hold the phone 15 to 20 cm from the printed or displayed code. If scanning fails, most providers include a manual activation code formatted as SM-DP+ Address and Activation Code. Enter both fields exactly as shown, including uppercase letters.
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Wait for the download to complete
The eSIM profile downloads over Wi-Fi. This takes 30 to 90 seconds on most devices. Do not close the Settings app or disable Wi-Fi during this step. Some Android devices restart the cellular radio after installation, which is normal and takes another 20 to 30 seconds.
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Set the data line to your travel eSIM
After installation, return to SIM Manager (Samsung) or Settings > Network > SIMs (Pixel). Set the eSIM as your "Mobile Data" or "Internet" line. Set your physical SIM as the "Calls" line to keep your home number active. Confirm the settings saved by checking the status bar -- you should see signal from both SIMs.
The Right Strategy: Which SIM Handles What
The standard dual SIM travel setup assigns each function to the right line. Mixing this up is the source of most roaming bill surprises.
- Incoming and outgoing calls to your home number
- SMS and MMS to your home number
- Two-factor authentication codes sent to your home number
- Voicemail on your home number
- All mobile data: maps, apps, email, streaming
- WhatsApp, Telegram, and other internet-based calls
- Hotspot if included in the eSIM plan
- Local phone number (if the eSIM provider assigns one)
Turn off data roaming on your home SIM
Even with the travel eSIM set as the data line, your home SIM can still roam if a background app or system process requests data and the phone falls back to it. On iPhone: Settings > Cellular > [Home SIM] > Data Roaming -- turn it off. On Android: Settings > Connections > SIM Manager > [Home SIM] > Mobile Data -- disable. This creates a hard block on roaming charges.
Carrier Compatibility and Lock Status
eSIM support exists on most major carriers, but carrier lock rules vary. A locked phone can only add eSIMs from its home carrier or approved partners. Check the table below before assuming your travel eSIM will install cleanly.
| Carrier | eSIM support | Lock and unlock notes |
|---|---|---|
| AT&T (US) | Yes | Supports eSIM on iPhone 12 and later, Pixel 4 and later, Galaxy S21 and later. Carrier-locked AT&T devices require 60 days of active service before unlocking for third-party eSIMs. |
| T-Mobile (US) | Yes | Broad eSIM support across iPhone and Android flagships. T-Mobile allows simultaneous physical SIM + eSIM. Some prepaid T-Mobile plans restrict eSIM use -- check the specific plan. |
| Verizon (US) | Yes | Verizon supports eSIM on compatible devices. Devices purchased from Verizon are locked for 60 days after activation. eSIM transfer from Verizon line to a travel eSIM requires the home line to remain active. |
| Vodafone UK | Yes | Full eSIM support on iPhone and Samsung Galaxy devices. Vodafone-sold phones are typically network-locked for 30 days. Unlock requests can be submitted online and processed within 5 working days. |
| EE (UK) | Yes | eSIM available across EE pay monthly plans. EE-locked handsets require 6 months of service before the unlock request is accepted. PAYG EE devices can be unlocked immediately. |
| O2 (UK) | Yes | O2 supports eSIM on iPhone XS and later, Google Pixel 4 and later, and select Samsung models. O2 devices are locked until contract obligations are met or the unlock fee is paid. |
| Telstra (Australia) | Yes | Telstra supports eSIM on iPhone, Pixel, and Samsung flagships. Telstra-purchased handsets are not network-locked, so adding a travel eSIM alongside the Telstra SIM works without an unlock request. |
| Rogers (Canada) | Yes | Rogers supports eSIM on iPhone 12 and later and select Android devices. Rogers-locked phones require the device to be on an active Rogers plan for 90 days before unlocking. Unlock requests are submitted through the Rogers My Account portal. |
To check whether your specific device is locked, insert a SIM from a different carrier. If the phone shows "SIM Not Supported" or "Invalid SIM", it is carrier locked. You can also dial *#06# to see your IMEI and check it at your carrier's unlock portal.
5 Common Dual SIM Problems and How to Fix Them
Most dual SIM travel problems come from a wrong settings choice, not a hardware or compatibility failure. Work through these fixes before contacting your provider.
Phone sends data through the wrong line
Why: The data line setting was not changed after adding the travel eSIM. Many phones default back to the original line after an update or restart.
Fix: Go to Settings > Cellular > Cellular Data (iPhone) or Settings > Connections > SIM Manager > Mobile Data (Samsung) and manually select your travel eSIM. Check again after any phone restart.
iMessage deactivated on home number
Why: Switching lines sometimes causes iMessage to drop the registration for the affected number.
Fix: Go to Settings > Messages and toggle iMessage off, then back on. Wait 30 seconds. Your home number should re-register. If not, sign out of Apple ID in Messages settings and sign back in.
WhatsApp asks to change your phone number
Why: WhatsApp detects the new eSIM as a new SIM and may prompt you to update your registered number.
Fix: Do not tap "Update Number". Close the WhatsApp prompt. WhatsApp is registered to your phone number, not your SIM. As long as you can receive SMS to your home number, your WhatsApp account stays intact. Use your home SIM for WhatsApp verification if prompted.
Voicemail not forwarding to the travel number
Why: Voicemail on the home line routes to your home carrier, not your travel eSIM. The travel eSIM may not have voicemail configured at all.
Fix: Voicemail for your home number still works normally. Anyone calling your home number while you are abroad reaches your home voicemail as usual. Travel eSIMs from data-only providers do not include voicemail. Use a voicemail-to-email service on your home plan if you need to check messages without international roaming.
Battery draining faster than usual
Why: Running two active cellular radios increases power consumption. Both SIMs search for signal constantly.
Fix: If you do not need calls on your home number while traveling, set the home SIM to standby mode rather than keeping it active for both calls and data. On iPhone: Settings > Cellular > [Home SIM line] > Turn Off This Line. This stops the radio from searching for signal on that line while still allowing you to re-enable it later.
Dual SIM Travel FAQ
Can I use dual SIM if my iPhone is locked to my home carrier?
Does dual SIM work on all iPhones?
Will I be charged roaming fees on my home SIM if it is active in dual SIM mode?
Can I switch between SIMs for calls mid-trip?
How do I know which SIM is being used for a call?
Can Android phones use two eSIMs without a physical SIM?
Find a travel eSIM for your destination
Once your dual SIM is configured, you need a reliable eSIM plan for your destination. HelloRoam offers data plans for 185+ countries that activate in minutes and start only when you first use data, not on the purchase date.
Country SIM Card Guides
Detailed SIM card and eSIM guides for popular destinations.