Does an eSIM Have a Phone Number? Calls, SMS and OTPs

The short version: most travel eSIMs are data only

When you buy a travel eSIM from Saily, Holafly, Nomad or most of Airalo's country plans, you are buying mobile data and nothing else. There is no phone number attached, you cannot dial a normal call from it, and nobody can send you an ordinary SMS on it. That surprises a lot of first-time buyers, but for most trips it is exactly what you want.

The reason is that almost everything people use a phone for abroad now runs over data. WhatsApp messages and calls, FaceTime, iMessage, Google Maps, Uber, Careem, banking apps and hotel check-in all need an internet connection, not a phone number. A data-only eSIM covers all of that at a fraction of what your home carrier charges for roaming.

What a data-only eSIM does not cover is the one thing a phone number is still essential for: receiving SMS codes from your bank and other services back home. The good news is that you do not have to choose. Modern phones hold two lines at once, so the travel eSIM handles data while your normal SIM stays on for calls and texts.

Data-only eSIM vs an eSIM with calls and SMS

A small number of travel eSIMs do come with a number. Airalo's Discover+ global eSIM has a version with data, calling minutes and texts on a new phone number, and Airalo also sells some local US and UK plans with a number. Saily has started offering an optional US number as a separate add-on in its app. These are useful in specific cases, which we cover further down, but they cost more per gigabyte than a plain data plan.

For a typical one or two week trip, the comparison below is the one that matters. In almost every row, the data-only eSIM plus your existing home number does the job better than paying for a second number you will barely use.

Keep your home number on: the dual SIM setup

Every iPhone from the XS and XR onward, and most recent Samsung, Google Pixel and other Android phones, can run two lines at the same time. Apple calls this Dual SIM, and its own support page describes exactly this travel use: keep your normal number for calls and texts, and add a local data plan for the trip. Our guide to using an eSIM and a physical SIM together walks through the screens in detail.

The setup is simple once you know which switch does what. The travel eSIM becomes your mobile data line. Your home SIM stays switched on as a voice and SMS line, but with data roaming turned off, so it cannot quietly download anything at roaming prices. On an iPhone the setting lives under Settings, Mobile Data (or Cellular), where you choose which line handles data; on Android it is usually under Settings, Connections or Network, then SIM manager.

Bank OTPs and SMS codes while you are abroad

This is the question that matters most to people traveling from Pakistan, India, the UK and the US, because a blocked card or an app login you cannot complete can ruin a day abroad. Bank one-time passwords are ordinary text messages, and they arrive on your home number as long as that SIM is in the phone, switched on, and able to connect to a network in the country you are visiting.

Receiving a text while roaming is free on most carriers worldwide, and a phone sitting on a foreign network with data roaming off uses no measurable data. Sending texts and making or answering normal calls usually does cost money, so the safe habit is to let codes come in and do everything else over WhatsApp or other apps on your eSIM data.

The catch is the word able. Some prepaid lines, including many in Pakistan and India, only register on foreign networks if international roaming is activated on the account. If it is not, the SIM shows no service abroad and the codes never arrive. Check this with Jazz, Zong, Telenor, Ufone, Jio, Airtel or whichever carrier you use before you leave, ideally a week ahead, because activation sometimes needs a balance or a visit to a branch.

If a code still does not arrive after you land, look at the home line first. It should show a network name rather than No Service. Restart the phone or switch airplane mode on and off, then try choosing a network manually in the carrier settings for that line, since some home carriers only have roaming agreements with one or two networks in each country. Ask the bank to resend the code only once the line shows a signal.

Making calls abroad without a phone number

With a data-only eSIM, calls happen inside apps. WhatsApp voice and video, FaceTime Audio and FaceTime video, Google Meet, Telegram and Zoom all work over mobile data. The person you call sees your usual WhatsApp or Apple ID details, because those accounts are tied to your phone number and your Apple ID, not to whichever SIM is supplying the data. Your WhatsApp account keeps working even though your number is sitting on a different line.

Internet calls use less data than most people expect, although video adds up quickly. The figures below are typical ranges; real use varies with network quality and the app's own settings. Daily video calls home are usually the single biggest data cost on a family trip, so budget for them separately from maps and messaging.

Your home carrier may also support Wi-Fi Calling, which lets you make and receive normal calls on your home number over a Wi-Fi connection, usually charged as if you were at home. Whether it works abroad depends on the carrier, so check before relying on it.

Countries where internet calls are restricted

A data-only eSIM assumes you can make calls over the internet. In a few countries that assumption breaks, and the United Arab Emirates is the one that catches the most travelers. In the UAE, internet calling is a licensed telecoms service, and WhatsApp voice and video calls and FaceTime Audio are blocked by the regulator, the Telecommunications and Digital Government Regulatory Authority↗. WhatsApp text messages, photos and voice notes still work normally. Licensed apps such as Botim are allowed, and business tools like Microsoft Teams and Zoom generally work. Our UAE eSIM guide covers this in more detail.

Saudi Arabia lifted its block on WhatsApp and similar calls in 2017, and calls over a travel eSIM work normally in Makkah, Madinah, Jeddah and Riyadh. That matters for pilgrims, who often coordinate a whole family group by WhatsApp. Plans and network notes are on our Saudi Arabia eSIM guide.

China blocks WhatsApp, Google services and many Western apps entirely. Some travel eSIMs route their data through Hong Kong or another country, which can mean those apps work where a local Chinese SIM would not, but this varies by provider and is not something to assume without checking the specific plan.

When you genuinely need a local or extra number

There are situations where a data-only eSIM is not enough. Long stays where you need to receive food deliveries, taxi drivers or landlords calling you, restaurant and clinic bookings that insist on a local number, and work trips where clients need to call you on a local line all point toward a number in the country you are visiting.

For those cases you have three routes. A local SIM from the main carrier, such as STC in Saudi Arabia or du and Etisalat in the UAE, is the cheapest way to get a real local number for a long stay. An eSIM with a number, such as Airalo's Discover+ global plan with calls and texts, avoids an airport queue and gives you a number that works across many countries, but with a limited bundle of minutes and texts. And for occasional calls to landlines back home, a calling app that sells call credit can be cheaper than either.

For most holidays and for Umrah, none of these is necessary. The ride-hailing apps Uber and Careem, hotel bookings and the Nusuk app all work with your home number and data from the eSIM; our Nusuk and Rawdah permit guide explains why Nusuk does not need a Saudi number at all.

International calling SIM cards and roaming calls

Before eSIMs, frequent travelers bought international calling SIM cards to avoid roaming charges on calls. They still exist, but for most people they have been overtaken by free internet calls over a data eSIM. A calling card only makes sense if the people you need to reach do not use WhatsApp or similar apps, or if you are calling landlines and businesses.

Normal roaming calls on your home SIM are the expensive option. Answering a call abroad is often charged too, not just making one, which surprises people who assume only outgoing calls cost money. If you expect calls from people who will not use apps, the cheapest approach is usually to ask them to message you on WhatsApp, or to set up call forwarding to a number you can answer over the internet, rather than answering on roaming.

Mistakes that cause surprise bills or missed codes

The most expensive mistake is leaving data roaming on for the home line. If the travel eSIM drops for a moment, the phone can switch to the home SIM for data, and a few minutes of photo backups or app updates at roaming rates can cost more than the whole eSIM. Turning data roaming off on the home line, and turning off the iPhone setting that allows mobile data switching, prevents that.

The second is removing the home SIM entirely to be safe. That stops the bill, but it also stops every bank code, which is usually worse. The third is installing the travel eSIM at the airport on weak Wi-Fi, which is the most common reason installs fail. Do it at home the night before; our step-by-step install guide covers the details.