Travel eSIM from the US: Set One Up and Keep Your US Number

A travel eSIM doesn't have to replace your US number. On supported iPhones, you can run one eSIM for your home number and a second one for the country you're visiting. Your bank's texts, your family's calls and your group chats stay tied to the number they already know, and the travel plan quietly handles the data.

Most of the setup happens before you leave. The part people get wrong isn't buying the eSIM. It's deciding which line does what, and knowing where your home carrier can still bill you.

What the travel eSIM is for, and what it isn't

Think of your phone as holding two separate lines. Apple's Dual SIM feature lets an iPhone keep two active phone numbers or SIMs to make and receive calls and text messages. Your US line stays your identity. The travel line is there for data.

If you keep both lines switched on, everything your primary line normally does keeps working. If you'd rather run on the travel eSIM alone, FaceTime and iMessage still work on your home line.

That second option matters more than it sounds. Someone texting your iPhone from the US over iMessage still reaches you, even with your US line switched off. Regular SMS is a different story, and we'll get to it below.

Before you buy: model, lock, and two-eSIM support

Is your phone new enough?

Apple lists the iPhone XS, iPhone XS Max, iPhone XR or later for using eSIM while traveling. To keep your US line on an eSIM and add a second eSIM for the trip, look for an iPhone 13 or newer: those models support Dual SIM with two eSIMs, not only a physical SIM plus an eSIM.

On Android, Google's own phones are a clear example. A Pixel 7 or later can use two eSIM profiles at once, as long as your carrier allows it. And if you bought a Pixel 10, Pixel 10 Pro or Pixel 10 Pro XL in the US, there's no SIM tray to fall back on: those models are eSIM-only.

Is it locked to your carrier?

Skip this check and you may pay for an eSIM your phone can't use. An iPhone that's locked to a carrier can't use another carrier's service abroad.

Checking takes seconds. Open Settings, tap General, then About. Next to Carrier Lock, you want to see "No SIM Restrictions." Anything else means a call to your carrier before you pay for a travel plan, not after.

Local carrier eSIM or worldwide data eSIM?

You'll run into two broad kinds of travel eSIM.

Plans from a carrier in the country you're visiting. Many of these plans come with a local phone number. That's handy if a hotel, a tour guide or a landlord in Lisbon needs to call you on a Portuguese number. Activation is digital, for example through a QR code or the carrier's app, and depending on local rules you may be asked to show ID such as your passport to buy one.

A prepaid data plan from a worldwide provider. These cover travel in over 190 countries or regions. You get data, not a new local number, which suits a two-week trip through three countries where the only thing you need is maps, messaging apps and email.

Either way, your US number stays on the other line. If you expect to make ordinary calls to local numbers, look up the dialing pattern before you go. Our international calling guide covers the basics, and country pages such as how to call the UK or how to call Mexico show the exact digits. The UK phone number format page helps when a number on a booking confirmation looks wrong.

Setting it up, step by step

1. Connect to Wi-Fi at home. An iPhone needs Wi-Fi or a hotspot to set up the eSIM; only some eSIM-only models in some countries can skip that. Your home network the night before a flight beats airport Wi-Fi at the gate.
2. Add the plan. Scan the QR code or follow the carrier app.
3. Label both lines. Apple suggests labeling your plans once the second one is active; the labels are what you pick from when choosing a number for calls, messages and cellular data. "US" and "Travel" work. "Primary" and "Secondary" tell you nothing when you're half awake in a taxi.
4. Pick the data line. An iPhone can only use one number at a time for cellular data. On a Pixel it's the same principle: you choose SIMs for calls, texts and mobile data under Network & internet > SIMs, and only one SIM can be the default for data. Set it to Travel.
5. Decide when it goes live. Google's advice for Pixel owners is to use a prepaid eSIM from international carriers and activate it once you arrive, to avoid roaming charges. Install at home, switch on at the destination.

Where roaming fees can still reach your US line

Your home carrier's meter doesn't stop just because a travel eSIM is installed. When you use both lines, your travel eSIM carries the data, but Apple warns you might still incur roaming fees from your home eSIM. How your carrier bills calls and texts on that line while you're abroad depends on your plan.

Two things limit the damage. First, keep data roaming off on the US line. Apple's path is Cellular Data, then Cellular Data Options, then turn off Data Roaming. With two lines, tap the US number first so you're changing the right one.

Second, ask your carrier what it charges for incoming calls and texts abroad on your plan. If the answer makes you wince, switch the US line off and live on the travel eSIM, with FaceTime and iMessage still reaching you on your home line. The trade-off: with the US line off, ordinary SMS sent to that number won't reach you until you turn it back on. Think about bank verification codes before you choose.

Planning calls home around a six- or nine-hour gap? Check our time zones page before you ring your parents at what turns out to be dawn. And when you dial the US from a local line, remember the +1 North American Numbering Plan prefix goes in front of the number.

Coming home

With iOS 26 and later, an iPhone can switch off the travel eSIM and turn your home SIM back on by itself when you return, depending on your country or region. That depends on where you are, so check anyway. Before you leave the airport, open Settings, check that the US line is on and set for cellular data, and turn off the travel line.

FAQ

Can I keep my US number with a travel eSIM?

Yes. On supported iPhones one eSIM holds your home number and another covers your destination.

How do I know if my iPhone can use another carrier's eSIM?

Settings, General, About. "No SIM Restrictions" next to Carrier Lock means it can.

Will I still get texts on my US number?

With both lines on, your primary line keeps working, so you can still receive texts. Your home carrier may bill roaming fees for that line, though.

Can I have two eSIMs at once?

On iPhone 13 and later, yes. On a Pixel 7 or later, yes, if your carrier allows it.

Do I need Wi-Fi to install an eSIM?

On an iPhone, generally yes: it has to be on Wi-Fi or a hotspot, with an exception for some eSIM-only models in some countries.

Sources

1. Apple Support: Use eSIM while traveling internationally with your iPhone (accessed 2026-09-24)
2. Apple Support: Using Dual SIM with an eSIM (accessed 2026-09-24)
3. Google Pixel Phone Help: Learn more about eSIMs (accessed 2026-09-24)
4. Google Pixel Phone Help: How to use dual SIMs on your Google Pixel phone (accessed 2026-09-24)
5. Apple Support: About cellular data roaming options for your iPhone and iPad (accessed 2026-09-24)