Understanding eSIMs: What They Are, Why You Need Them, and How to Use Them

A comprehensive guide to eSIMs: what they are, why they’re useful for international travelers, and how to get started with them. Learn how eSIMs simplify mobile connectivity and improve your travel experience.
Understanding eSIMs: What They Are, Why You Need Them, and How to Use Them

What is an eSIM?

An eSIM (embedded SIM) is a digital SIM card built directly into your phone, tablet, or smartwatch. Unlike traditional SIM cards that you physically insert, an eSIM is programmable via software. This means you can download and switch between multiple mobile data plans without swapping out physical cards.

eSIMs are compatible with a wide range of modern smartphones including recent models from Apple, Samsung, Google, and others. They’re also being integrated into more laptops and wearables, making them a flexible solution for digital connectivity.

Why Use an eSIM for Travel?

Travelers benefit immensely from eSIMs for several key reasons:

  • Instant Connectivity: Buy and activate an eSIM plan before or upon arrival at your destination—no waiting in line at kiosks or dealing with unfamiliar networks.
  • No Physical Swaps: You can keep your home SIM installed while using an eSIM for data abroad, allowing you to receive texts and calls from your primary number.
  • Cost Efficiency: Many eSIM providers offer affordable international data plans, often cheaper than traditional roaming packages.
  • Environmentally Friendly: No more plastic waste from disposable SIM cards.

How to Get and Use an eSIM

1. Check Device Compatibility

Make sure your device supports eSIMs. Most flagship phones from the past few years include eSIM functionality.

2. Choose an eSIM Provider

Some popular eSIM providers for travelers include:

  • Airalo: Offers a global marketplace with local, regional, and global plans.
  • Nomad: Competitive pricing and regional packages.
  • Holafly: Unlimited data options for many countries.
  • GigSky, Ubigi, BNESIM, and SimOptions also provide flexible travel plans.

Each provider differs in pricing, data limits, and country availability, so it’s worth comparing based on your destination and data needs.

3. Purchase and Install

After choosing a plan:

  • Purchase it online or through the provider’s app.
  • Receive a QR code or activation code.
  • Scan it with your device or follow in-app instructions.
  • Activate the eSIM and switch to it in your phone’s settings.

Downsides of eSIMs

While convenient, eSIMs come with some trade-offs:

  • Limited Device Compatibility
    Not all smartphones support eSIMs. Older or budget models may not include the necessary hardware.

  • Carrier and Country Restrictions
    Some mobile carriers and regions do not support eSIM, or only offer it for postpaid plans. This can be a problem for travelers who need prepaid flexibility.

  • No Physical Backup
    If your device is lost, stolen, or damaged, restoring your number or data connection can be harder than simply inserting a replacement SIM.

  • Data-Only Limitations
    Many eSIM travel plans are data-only, meaning no traditional voice calls or SMS unless using VoIP apps like WhatsApp or Skype.

  • Complex Setup for Some Providers
    Some eSIM services require installing apps or following detailed activation steps, which can be a challenge in areas with poor or no internet access.

Best Use Cases

  • Frequent Travelers: Easily switch between countries without changing SIM cards.
  • Digital Nomads: Maintain connectivity across borders with minimal setup.
  • Business Travelers: Keep your business number while accessing affordable local data.
  • Emergency Backup: Add an eSIM plan as a fallback in case your main SIM fails or has poor coverage.

Final Thoughts

eSIMs represent a flexible, modern approach to staying connected while traveling. Despite a few limitations, they eliminate the hassle of finding local SIM cards, offer cost savings, and streamline international connectivity. As adoption expands, eSIMs are becoming an essential tool for smart travelers.