eSIM: What is it, and how does it work?

An eSIM, or embedded SIM, is a digital alternative to the traditional physical SIM card. Integrated directly into most modern smartphones, it functions just like a physical SIM—without requiring any insertion or removal. eSIM technology offers several advantages, including seamless switching between mobile carriers, simplified activation processes, and the ability to avoid costly roaming fees when traveling.

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What is an eSIM?

An eSIM is an embedded subscriber identity module — essentially, a built-in chip in your phone. It does everything a traditional SIM would do, but without having to slot a tiny card into your phone. Additionally, an eSIM allows you to use several carriers and phone numbers at once, which is super convenient.

eSIMs are available on smartphones, tablets, smartwatches, and even some cars! They’re great for quickly switching between phone numbers and grabbing mobile data for travel.

How does an eSIM work?

An eSIM uses preinstalled software on your device to work just like a physical SIM. Once you activate it, you can connect to a cell network, make calls, and use mobile data. Most modern phones will have built-in eSIMs, but check our list of eSIM-compatible phones to see if yours does.

To start using an eSIM, just buy an eSIM plan and complete a quick setup. No need to remove your current SIM card — it can stay where it is, whether you decide to keep using it or not.

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How to set up an eSIM

Follow these steps to start using an eSIM on your iPhone or Android.

Setup an eSIM on iPhone with Roamvy app

Pick an eSIM data plan from Roamvy app.

Select the country you’re heading to and choose a plan.

Once you get the QR code, tap install in the app or scan it manually.

Tap “Install eSIM,” and follow the steps on the screen.

Your plan will automatically active and start when you arrive at your destination

Get ready for your trip — your plan will activate when you arrive.

Set up an eSIM manually on your iPhone

1. Go to “Settings”.
2. Tap “Cellular data” or “Mobile data”.
3. Tap “Add cellular plan”.
4. Touch "Enter information manually" at the bottom of your iPhone screen.
5. Paste the eSIM information shared by your provider.

Setup an eSIM on Android with Roamvy app

Pick an eSIM data plan for your trip.

Select the country you’re heading to and choose a plan.

Download the Roamvy eSIM app.

Tap “Install eSIM,” and follow the steps on the screen to set it up.

Your plan will automatically activate.

Get ready for your trip — your plan will activate when you arrive.

Set up an eSIM manually on your Android

1. Go to “Settings”, then “Connections”.
2. Tap “SIM manager”.
3. Select “Add eSIM”.
4. Tap “Scan the QR code” or choose another way to add your eSIM.

Roamvy eSIM benefits

eSIMs are the future of connectivity. Here are the main eSIM benefits.

No high roaming fees

Travelers can buy eSIMs that connect them to local carriers and avoid unexpected roaming fees.

Multiple profiles

You can have multiple virtual eSIMs on one device, making it easy to switch between different carriers and phone numbers.

Pay for what you need

Planning a week in Italy? Choose a weekly data plan-opt for a fixed GB package or go unlimited-customize it to fit your needs and keep those extra euros for another mouthwatering plate of pasta!

Saves space

The absence of a physical SIM card slot frees up space for other device upgrades (like a bigger battery or more handset features).

Can’t get lost or stolen

Swapping out tiny SIM cards is tricky, especially if you’re on the move. An eSIM is built in, so it won’t get lost or stolen.

Less waste

A single plastic SIM won’t destroy the planet, but getting a newly packaged SIM card for every trip adds up over time. Use an eSIM instead.

What is the difference between an eSIM and a physical SIM?

The main difference between an eSIM and a traditional SIM card is that an eSIM is digital while a SIM card is a physical chip.

	eSIM	SIM
Phone numbers	Up to two*	Up to two
Network Operators	As many as you like	Up to two
Removal	Deactivate the profile	Remove the SIM card
Activation	Manual or automatic (plan activates at your destination)	Manual (need to insert a card into your device)
Compatibility	Newer devices only	Old and most new devices
Using abroad	Affordable — easy to get data plans for different countries	May be expensive due to roaming

*Roamvy is all about mobile data right now, so we don’t support phone numbers yet. Don’t worry — we’re working on it.

Get an eSIM data plan

Find a mobile data plan for your next trip — search our list of destinations.

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