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How Do I Call and Text With an eSIM? Defy Mobile eSIM Guide

Author

Ben Rogojan

August 12, 2025

“I’ve got data eSIM… but why can’t I call or text?”

If you’ve recently switched to an eSIM while travelling, you’ve probably hit this roadblock. You installed it, your internet works, but when you try to make a regular call or send an SMS, nothing happens. It’s confusing and frustrating, especially when you're on your international trip.

This blog clears the fog. 

If you travel a lot, whether for work or leisure, you need to understand eSIMs in 2025. This is important for making calls and sending texts while abroad.

What works now, what’s coming next, and what to do in the meantime?

What Is an eSIM and How Does It Work?

An eSIM (short for “embedded SIM”) is a digital version of the physical SIM card. It lives inside your phone’s hardware, which means you don’t have to swap out any trays or carry multiple cards. You just scan a QR code or enter details, and boom! You’re connected.

But there’s a catch. Most travel eSIMs, including Defy Mobile (for now), are data-only. You can browse, stream, and message using apps. However, you cannot make regular voice calls or send texts through your carrier unless you have extra services.

Does Defy Mobile eSIM Support Calls and SMS?

At this moment, Defy Mobile’s eSIM plans are data-only. These are made for quick and easy internet access worldwide. They are great for using apps like WhatsApp, FaceTime, Signal, and Telegram.

However, Defy is launching a new lineup of eSIM data plans, also with voice + SMS, very soon. These plans will give you full mobile functionality, just like your regular SIM, but without swapping cards.

How to Call and Text Using a Data-Only eSIM?

Just because your eSIM doesn’t support traditional voice or SMS doesn’t mean you're cut off. With a bit of know-how, you can stay fully connected using internet-based alternatives:

For Voice Calls:

Use apps that work over data. These are some of the most popular and reliable:

  • WhatsApp Call
  • FaceTime Audio (iPhone only)
  • Skype
  • Google Voice
  • Telegram Call
  • Zoom or Teams (for work calls)

These apps let you make clear, reliable voice calls using just your data—no mobile network needed.

For Messaging and Texting:

Skip SMS. Instead, use the following VoIP apps:

  • WhatsApp / Telegram / Signal
  • Facebook Messenger
  • iMessage (for Apple users)
  • Google Chat / Hangouts

These apps allow you to send texts, photos, voice notes, and even files. All using your Defy Mobile eSIM data connection.

What If You Want to Keep Your Regular Number?

Nobody wants to change or lose their regular phone number because everyone has that to reach out. To not losing your primary SIM, here's a handy trick many travellers use:

  • Keep your physical SIM active in the phone for receiving texts or calls to your usual number (like OTPs or banking alerts).
  • Use the Defy Mobile eSIM for internet access abroad.

Phones like iPhones and most Android flagships now support Dual SIM Dual Standby so that you can stay connected to both numbers at once.

What to Expect from Defy’s Upcoming Voice + SMS eSIM Plans?

Defy Mobile eSIMs are data-only for now. But the demand of users for data+voice+sms eSIM is getting higher day by day. To provide users the convenient they deserve, Defy Mobile is close to launching new eSIM options that combine:

  • High-speed data
  • Native voice calling support
  • Outbound & inbound SMS
  • Multi-country support (ideal for travellers)
  • Easy setup via QR code

These new plans will give you the best of both worlds: the flexibility of eSIM plus full mobile service. 

Key Things to Know Before You Travel

Here’s what we recommend to all Defy Mobile users right now:

  • Install your eSIM before you leave your home country to avoid setup issues on the road.
  • Know your use case: If you just need internet access (for maps, translation, or booking rides), the current Defy data-only eSIM is perfect.
  • Use VoIP apps for calling and messaging to stay in touch.
  • Watch for the launch of Defy’s new plans if you prefer traditional calls and texts.

Conclusion 

If you want fast and affordable internet while travelling, Defy’s current data-only eSIM works great. For messaging and calling, use apps, and remember that soon, you’ll be able to do it all from one eSIM.

Until then, stay connected your way with clarity, with ease, and with Defy Mobile in your pocket.

FAQs 

Can I call with a data-only eSIM?

Yes, using VoIP apps like WhatsApp, FaceTime, or Skype over the internet.

Will Defy Mobile offer eSIMs with calling and SMS?

Yes, Defy is launching new eSIM plans soon with voice + SMS + data.

Can I keep my regular number while using an eSIM?

Yes, most phones let you use your physical SIM alongside the eSIM.

Do I need a special app to text with a data eSIM?

No, but you’ll need to use internet-based apps like WhatsApp or Telegram.

Can I get texts for my bank or 2FA on a data eSIM?

Not directly, but you can keep your physical SIM active for that to receive OTPs.



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