One of the biggest questions people ask before buying their first travel eSIM is:

"Can I still make calls and send text messages?"

The answer is:

Yes—but not in the traditional way.

Most travel eSIMs sold today are data-only plans. That means they provide mobile internet access but do not usually include a traditional phone number, voice minutes, or SMS messaging.

At first, this sounds like a major limitation.

However, the reality is that most international travellers already use internet-based communication apps for calls and messages. As long as your data-only eSIM provides a reliable internet connection, you can continue using services like WhatsApp, FaceTime, Telegram, Signal, Microsoft Teams, Zoom, Google Meet, and many others.

This guide explains exactly what works, what doesn't, and how to stay connected while travelling.

What Is a Data-Only eSIM?

A data-only eSIM provides:

• Mobile internet

• Access to supported cellular networks

• Data connectivity for online apps

It does not usually include:

• Traditional mobile phone number

• Cellular voice calling

• SMS text messages

This is the standard type of travel eSIM offered by most international eSIM providers.

Why Are Most Travel eSIMs Data-Only?

There are several reasons.

Providing data-only plans allows travel eSIM providers to:

• Offer lower prices.

• Simplify international activation.

• Cover many countries with one product.

• Avoid managing local telephone numbers.

• Focus on internet connectivity rather than voice services.

Since most travellers now communicate through internet apps, this approach meets the needs of the majority of users.

Can You Make Phone Calls?

Yes—but there are two different types of calls.

Traditional Cellular Calls

These use your mobile carrier's voice network.

They require:

• A phone number

• Voice service

• Carrier support

Most data-only travel eSIMs do not include traditional voice calling.

Internet Calls (VoIP)

These use your mobile data connection.

Examples include:

• WhatsApp Calls

• FaceTime Audio

• FaceTime Video

• Telegram Calls

• Signal Calls

• Microsoft Teams

• Zoom

• Google Meet

• Discord Voice

These services work normally as long as your eSIM has an internet connection.

Does WhatsApp Work with a Data-Only eSIM?

Yes.

This is one of the biggest advantages of a travel eSIM.

Your WhatsApp account is linked to your existing phone number, not to the specific SIM card currently providing your internet connection.

That means you can usually:

• Send messages

• Make voice calls

• Make video calls

• Share photos

• Share videos

• Send documents

• Join group chats

without changing your WhatsApp number.

As long as your data-only eSIM is connected to the internet, WhatsApp functions just as it does at home.

Will My WhatsApp Number Change?

No.

Installing a travel eSIM does not automatically create a new WhatsApp account or change your existing number.

Your contacts continue to see the same WhatsApp profile they already know.

Unless you intentionally change your WhatsApp number within the app, your account remains the same.

Can You Send SMS?

This depends on the type of message.

Traditional SMS

Most data-only travel eSIMs do not support:

• SMS

• MMS

because they do not include a mobile phone number.

Internet Messaging

You can continue using:

• WhatsApp

• Telegram

• Signal

• Facebook Messenger

• Instagram Direct Messages

• Snapchat

• WeChat (where available)

These apps use mobile data instead of the SMS network.

What About iMessage?

If you're using an iPhone:

iMessage continues to work over mobile data or Wi-Fi, provided it remains activated on your Apple ID or phone number.

This allows you to continue sending:

• Text messages

• Photos

• Videos

• Documents

to other Apple users.

Standard SMS messages, however, still depend on your mobile carrier.

What About FaceTime?

FaceTime works very well with travel eSIMs.

You can make:

• FaceTime Audio

• FaceTime Video

using your eSIM's internet connection.

This is one reason many iPhone users find data-only travel eSIMs sufficient for international trips.

Does RCS Messaging Work?

Many Android devices now support Rich Communication Services (RCS) through Google Messages.

RCS features such as:

• Typing indicators

• Read receipts

• High-quality image sharing

• Internet messaging

generally work over mobile data when supported by your device, carrier, and messaging app configuration.

Availability can vary by region and carrier.

Can You Receive Banking OTPs?

Many travellers worry about banking verification codes while abroad.

The answer depends on your setup.

If You Keep Your Home SIM Active

Many dual-SIM smartphones allow you to:

• Keep your regular SIM for SMS.

• Use the travel eSIM for data.

This is often the best solution because you can continue receiving:

• Banking OTPs

• Two-factor authentication codes

• Verification messages

while avoiding expensive data roaming.

If You Remove Your Home SIM

If your banking provider sends SMS only to your home number, removing or disabling that SIM may prevent you from receiving those messages.

Before travelling, check whether your bank also supports:

• Authenticator apps

• Push notifications

• Email verification

Can You Call Local Businesses?

With a data-only eSIM:

Traditional cellular calls to local businesses usually require:

• Your home SIM

• Internet calling services

• Another supported calling method

Some businesses also offer communication through messaging apps or online platforms.

Can Someone Call Your Home Number?

If your home SIM remains active and your carrier settings allow it, people can usually continue calling your regular number.

Be aware that answering traditional cellular calls while travelling may still be subject to your home carrier's roaming charges, depending on your plan.

Always review your carrier's roaming policy before travelling.

Common Apps That Work Perfectly with a Data-Only eSIM

Most travellers use these apps every day.

Messaging

• WhatsApp

• Telegram

• Signal

• Messenger

• iMessage

• WeChat (where available)

Voice & Video Calls

• WhatsApp

• FaceTime

• Zoom

• Google Meet

• Microsoft Teams

• Discord

Productivity

• Slack

• Gmail

• Outlook

• Google Workspace

• Microsoft 365

Navigation

• Google Maps

• Apple Maps

• Waze

Travel

• Airline apps

• Hotel apps

• Ride-hailing apps

• Translation apps

As long as you have mobile data, these services continue working normally.

Do You Actually Need a Phone Number?

For many travellers, no.

Most communication today happens through internet-based platforms rather than traditional voice calls and SMS.

Tourists commonly rely on:

• WhatsApp

• FaceTime

• Telegram

• Email

• Video meetings

instead of traditional phone services.

When You Might Need a Traditional Phone Number

A phone number can still be useful if you need to:

• Receive standard SMS messages.

• Make traditional voice calls.

• Open local bank accounts.

• Register for certain local services.

• Receive calls from organisations that don't support internet messaging.

For long-term stays, a local carrier plan may be more suitable if these services are essential.

Common Misconceptions

"A data-only eSIM can't make calls."

Not true.

It supports internet-based calling apps such as WhatsApp and FaceTime.

"WhatsApp won't work without a phone number."

Incorrect.

WhatsApp remains linked to the number used when the account was registered.

Changing your internet connection doesn't automatically change your WhatsApp account.

"I need a local SIM just for WhatsApp."

False.

WhatsApp works perfectly over a travel eSIM's data connection.

"Installing an eSIM changes my contacts."

No.

Your contacts, chats, and messaging apps remain unchanged.

Why Travelers Choose eSIMLLY

Most international travellers primarily need reliable mobile data rather than traditional voice services.

eSIMLLY provides travel eSIM services in more than 160 countries and regions, offering destination-specific and regional data plans that work seamlessly with popular internet-based communication apps such as WhatsApp, FaceTime, Telegram, Microsoft Teams, Zoom, and more. With instant digital delivery, transparent pricing, and straightforward activation, travellers can stay connected from the moment they arrive without changing physical SIM cards.

Whether you're travelling for business, leisure, study, or a multi-country adventure, eSIMLLY helps you stay connected with the apps you already use every day.

Final Thoughts

A data-only eSIM may not include a traditional phone number, voice minutes, or SMS, but for most travellers, that isn't a significant limitation. Thanks to modern internet-based communication apps, you can continue making voice and video calls, sending messages, sharing photos, joining meetings, and staying in touch with friends, family, and colleagues using your mobile data connection.

If you also need to receive SMS verification codes or traditional phone calls, keeping your home SIM active alongside your travel eSIM is often the best solution. By understanding the difference between cellular voice services and internet-based communication, you can choose the right setup for your trip and enjoy reliable connectivity wherever you travel.

The future of travel is connected, digital, and increasingly seamless—and embedded eSIMs are becoming one of the technologies making that future possible.

As more travellers, enterprises, and device manufacturers embrace eSIM technology, staying connected across borders is becoming simpler than ever. With eSIMLLY providing travel eSIM services in more than 160 countries and regions, international travellers can enjoy reliable mobile connectivity wherever their journey takes them.