Dual SIM on iPhone and Android: your US number for calls and texts, a travel eSIM for data

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You may not need a second line: if your carrier plan already includes data where you are going, stay on it. The bill trap is the US line itself, where an answered call, a sent text or stray data can start your carrier’s day pass.

For two carriers on one phone, check Is my phone unlocked? and Does my phone support eSIM? first.

What is dual SIM, and does your phone have it?

Dual SIM means one phone runs a primary and secondary line, and only one of them carries cellular data at a time. Apple lists it on iPhone XS, XR and later, with two eSIMs on iPhone 13 and later (checked on October 29, 2026, Apple Dual SIM).

Apple adds a condition: “To use two carriers, your carrier must unlock your iPhone, or both plans must be from the same carrier.” A travel eSIM counts as a second carrier.

Keep your US number for calls and texts, and your iMessage and FaceTime number, on the default voice line. Most of our plans are data only; check the plan’s calls/SMS fields. The travel eSIM becomes the cellular data line, also in a dual eSIM setup.

On Android, Google says a Pixel 3a or later can use one physical SIM and one eSIM. Two eSIM profiles need “a Pixel 7, Pixel 7 Pro, or later phone” and a carrier that allows it (Google).

Set it up on iPhone: labels, default line, data line

Dual SIM on iPhone needs two settings: a label for each line and the one line for cellular data. Both sit under Settings → Cellular, per Apple (checked on October 29, 2026, Apple).

Install the travel eSIM first (how to install an eSIM), then:

1. Open Settings → Cellular, tap your US number, tap Cellular Plan Label and pick a label, for example Home.
2. Tap the travel eSIM and label it Travel the same way.
3. Open Settings → Cellular → Cellular Data and select the travel line.
4. On the same screen, leave Allow Cellular Data Switching off while you travel.

Apple says that switch lets your iPhone “use cellular data from both plans, depending on coverage and availability.” Abroad, data on your US line is what can start a carrier day pass.

On iOS 26 and later, a Turn On Travel eSIM notification can appear when you arrive. Choose Travel eSIM and Current eSIM, not Travel eSIM Only, to keep your US number on. Apple says the travel eSIM is then used for data and warns: “You might still incur roaming fees from your home eSIM” (Apple).

Back home, iOS 26 switches back on its own, depending on your country or region. If not, enable Turn On this Line for your primary eSIM under Settings → Cellular. Menus can differ by model and software version.

Set it up on Pixel and Galaxy

On a Pixel or Galaxy, set your US SIM for calls and texts and the travel eSIM for data. Google says “Only one SIM can be the default for data” (checked on October 29, 2026, Google).

On a Pixel, open Settings → Network & internet → SIMs and turn on Mobile data. Under “Your primary SIMs,” choose the SIM for Calls, Texts and Data.

On a Pixel 8, Pixel 8 Pro or earlier, “During a phone call, all data goes through the SIM making the call,” Google says. Those phones have a Data during calls switch on the same SIMs screen.

On a Galaxy, go to Settings → Connections → SIM manager. The switch next to each SIM turns it on or off. Primary SIM sets the default for calls, texts and data (checked on October 29, 2026, Samsung).

Menus can differ: Google notes that “some of these steps work only on Android 11 and up.” Samsung adds: “Available screens and settings may vary by wireless service provider, software version, and device model.”

What happens to calls and texts on your US line abroad

With both lines on, Apple says “the capabilities on your primary line will continue to work” (checked on October 29, 2026, Apple). Calls and texts still reach your US number, and your carrier bills them under its roaming rules.

AT&T and Verizon say what starts a charge:

Source: AT&T International Day Pass · Verizon TravelPass FAQs.

Turn data roaming off on the US line and on for the travel eSIM; the steps are in what is data roaming. That stops stray data, not calls or texts: on both carriers an answered call or a sent text can start a day. What a code or text costs is covered in codes and texts abroad.

AT&T’s cruise article says that with an eSIM from a local or U.S. provider, “your original phone number is suspended” (AT&T, checked on October 29, 2026). It adds that iMessage won’t work. Apple’s page describes the iPhone itself: with both lines on, the primary line keeps working, which is the setup above.

Wi-Fi calling depends on the plan: Verizon says “Wi-Fi calling isn’t included with TravelPass” (checked on October 29, 2026). T-Mobile mentions texting over Wi-Fi Calling on in-flight Wi-Fi (checked on October 29, 2026, T-Mobile). On Google Fi Unlimited Premium, “Calls over Wi-Fi to the US, Canada & Mexico are included free” (checked on October 29, 2026, Google Fi).

Your carrier’s full rules: AT&T, Verizon, Mint Mobile, Visible. Changing phones is a different task: transfer an eSIM. Next step: pick a plan at the country eSIM hub.

Frequently asked questions

Sources are linked in the text. Carrier terms change: for the terms of your own plan, check with your carrier.

Texts and 2FA codes on your US number abroad, and what they can cost: keep your US number. More setup answers are on eSIM help.

Unfamiliar term? See the eSIM glossary.