Complete Beginner's Guide · Updated March 2026
How eSIM Works:Everything You Need to Know
Never dealt with an eSIM before? This guide explains what an eSIM is, how it works, whether your phone supports it, and how to set one up for your next trip — in plain language, with zero jargon.
What Is an eSIM? A Simple Explanation
An eSIM (embedded SIM) is a tiny chip built directly into your phone. Unlike a traditional SIM card that you physically insert, an eSIM is activated digitally — you simply scan a QR code, and your phone connects to a mobile network. No tools, no trays, no tiny cards to lose.
Built into your device
The eSIM chip is already soldered inside modern smartphones, tablets, and smartwatches. There's nothing extra to buy or install physically.
Activated in seconds
Instead of waiting for a physical card to arrive, you download a data profile instantly via a QR code. The entire process takes under 2 minutes.
Works in 195+ countries
A single eSIM can connect you to local networks worldwide. Buy a plan for Japan before your flight, and you'll have data the moment you land at Narita.
Keeps your main number active
Your phone runs two lines simultaneously — your home carrier stays on for calls and texts, while the eSIM handles affordable local data abroad.
Industry context: The GSMA (the global mobile industry body) standardized eSIM technology in 2016. Since then, over 200 mobile operators across 100+ countries have adopted it. Apple removed the physical SIM tray entirely from the iPhone 14 (US model) onward, signaling that eSIM is the future of mobile connectivity.
How to Set Up Your eSIM: Step-by-Step Guide
From purchase to connected in under 5 minutes. Here's exactly what to expect at every stage.
Choose Your Destination & Data Plan
Browse our 195+ supported countries and pick the data plan that fits your trip. Plans range from 1 GB for a short weekend getaway to unlimited data for extended stays.
- Filter by country, region, or data amount
- See exact pricing upfront — no hidden fees, taxes, or activation charges
- Plans start as low as $4.50 USD for 1 GB
- Regional plans (e.g., all of Europe) are available for multi-country trips
Pro tip: Not sure how much data you need? Most travelers use 1–2 GB per week for maps, messaging, social media, and light browsing. Video calls and streaming use significantly more — roughly 1 GB per hour.
Purchase & Receive Your QR Code Instantly
Complete your purchase securely with Apple Pay, Google Pay, or any major credit card. Within seconds, you'll receive an email containing your unique QR code.
- Payment is processed securely through Stripe
- Your QR code is emailed immediately — no shipping or waiting
- One QR code can be used on one device
- You can purchase multiple eSIMs for travel companions
Pro tip: Save your QR code email in an easily accessible folder. You'll need it during the installation step. You can also take a screenshot or print it.
Install the eSIM Before You Travel
Open your phone's settings, scan the QR code, and the eSIM profile will download automatically. This must be done while you still have internet access (Wi-Fi or mobile data).
- iPhone: Settings → Cellular → Add eSIM → Use QR Code
- Android: Settings → Network → SIMs → Add eSIM → Scan QR Code
- Installation requires an internet connection — do this at home or airport Wi-Fi
- The eSIM will appear as a secondary line in your phone settings
Pro tip: Install your eSIM 1–2 days before departure. This gives you time to troubleshoot if anything goes wrong, and you won't be rushed at the airport.
Activate When You Land at Your Destination
Once your flight lands, enable the eSIM data line in your phone settings and turn on data roaming for that line. Your phone will connect to a local network within seconds.
- Toggle the eSIM line to 'on' in your cellular settings
- Enable 'Data Roaming' specifically for the eSIM line
- Your phone will automatically find the strongest local network
- You'll have full internet access — maps, messaging, rideshare apps — immediately
Pro tip: Keep your home carrier line active for receiving verification texts (2FA codes from your bank, etc.) but use the eSIM line for all data. This dual-SIM setup gives you the best of both worlds.
eSIM vs. Physical SIM: Why Travelers Are Switching
Traditional SIM cards served us well, but eSIM technology solves every pain point travelers have faced for decades.
Based on real traveler feedback and industry standards from the GSMA eSIM specification.
Is Your Device eSIM Compatible?
Most phones manufactured after 2019 support eSIM. Here's a quick reference — or use the dial code *#06# on your phone to check for an EID number (if it appears, your device supports eSIM).
iPhones
- •iPhone XS / XR (2018) and all newer models
- •iPhone SE (3rd gen, 2022)
- •iPhone 14 US models — eSIM only, no SIM tray
- •iPhone 15, 16 series
Android Phones
- •Samsung Galaxy S20, S21, S22, S23, S24 series
- •Samsung Galaxy Z Flip / Z Fold (all generations)
- •Google Pixel 3, 4, 5, 6, 7, 8, 9 series
- •OnePlus, Xiaomi, Motorola — select models
Tablets
- •iPad Pro (3rd gen+), iPad Air (3rd gen+)
- •iPad Mini (5th gen+), iPad (7th gen+)
- •Samsung Galaxy Tab S series (select models)
- •Microsoft Surface Pro X, Pro 9
Smartwatches & Other
- •Apple Watch Series 3+ (GPS + Cellular)
- •Samsung Galaxy Watch 4, 5, 6 (LTE models)
- •Google Pixel Watch (LTE)
- •Some Windows laptops with LTE modules
Two requirements before you begin
- Your phone must be carrier-unlocked. Locked phones (common with contract plans) may block eSIM installation. Contact your carrier to unlock it — it's usually free after your contract period.
- You need an internet connection to install. The QR code download requires Wi-Fi or cellular data. Always install before you board your flight.
Frequently Asked Questions About eSIMs
Answers to the most common questions from first-time eSIM users.
Can I still receive calls and texts on my regular number while using an eSIM?
Yes. Your phone runs both lines simultaneously — your home carrier handles calls, texts, and verification codes, while the eSIM handles data. This is called dual-SIM mode and is supported by all modern smartphones.
Does an eSIM give me a local phone number?
No. Travel eSIMs like Lotsotravel are data-only plans. You won't get a local phone number, and you can't make traditional cellular calls or send SMS through the eSIM line. However, you can use WhatsApp, FaceTime, Zoom, or any internet-based calling app over the eSIM data connection.
What happens if I run out of data?
You can purchase a top-up directly from your Lotsotravel dashboard at any time. The additional data is added to your existing plan instantly — no need to install a new QR code. You can also monitor your usage in real time.
Can I use one eSIM in multiple countries?
It depends on the plan. Single-country plans work only in that country. Regional plans (like our Europe or Asia packages) cover multiple countries with one eSIM. Check the plan details before purchasing.
What if the eSIM doesn't work when I land?
First, make sure data roaming is enabled for the eSIM line (this is the most common issue). If that doesn't fix it, try toggling airplane mode on and off, or manually selecting a network in your cellular settings. Our 24/7 support team is also available via WhatsApp and email.
How many eSIMs can my phone store?
Most modern iPhones can store 8–10 eSIM profiles simultaneously (but only one or two can be active at once). Android devices vary, but typically support at least 5 stored profiles. You can delete old eSIMs and add new ones as needed.
Is eSIM safe and secure?
Yes. eSIM technology uses the same encryption and security protocols as physical SIM cards. In fact, eSIMs are more secure because they can't be physically removed, stolen, or cloned — a risk with traditional SIMs known as 'SIM swapping.'
Do I need to turn off my home carrier's data roaming?
We recommend it. Turn off data roaming for your home carrier line to avoid accidental roaming charges, but keep the line itself active for calls and texts. Only enable data roaming for the eSIM line.
Still have questions?
Ready to Try eSIM for Your Next Trip?
Join thousands of travelers who save money and skip the hassle of physical SIM cards. Browse plans for 195+ countries and get connected in minutes.
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