What Is an eSIM? How It Works, Benefits, and Supported Devices

An eSIM is a chip permanently built into your device that lets you activate a mobile plan by downloading a carrier profile — no physical card required. Activation takes minutes, and you can store multiple profiles on a single device and switch between them from your settings. The trade-off: if your device is lost or broken, you cannot pull out the eSIM and swap it into another phone.

This article explains how eSIM works, its advantages and limitations, and which devices support it. For step-by-step activation guides, see How to Set Up eSIM on iPhone via QR Code and How to Set Up eSIM on Android via QR Code.

How eSIM Works

The eUICC Chip and Profiles

An eSIM (embedded SIM) follows a global standard defined by the GSMA known as SGP.22 (RSP Technical Specification for Consumer Devices). The latest published versions are SGP.22 v2.6.1 (released April 2025) and SGP.22 v3.1 (released December 2023).

The hardware is an eUICC (embedded Universal Integrated Circuit Card) — a chip soldered to the device’s motherboard. It securely stores carrier profiles, which contain the credentials needed to authenticate with a mobile network.

When you sign up with a carrier, their system prepares a profile on an SM-DP+ server (Subscription Manager Data Preparation, defined in GSMA SGP.22). Your device connects to that server and downloads the profile. From that point on, the device can authenticate to the carrier’s network just as a traditional SIM card would.

How to Add a Carrier Profile

There are three standard ways to download an eSIM profile from a carrier’s SM-DP+ server:

1. Scan a QR code — the carrier emails or displays a QR code you scan in Settings
2. Enter an activation code manually — type the SM-DP+ server address and activation code by hand
3. Use a carrier app — some carriers offer an app that handles the download automatically

A fourth option — eSIM Quick Transfer — lets you transfer an eSIM between compatible devices without re-issuing from the carrier (supported on iPhone and select Android models with carrier approval). This is a device-to-device transfer, not a download from an SM-DP+ server.

Storing and Switching Profiles

Under SGP.22 v2.x, an eUICC can store multiple carrier profiles, but only one profile can be active at a time. The number of profiles a device can store depends on the eUICC chip’s memory — there is no fixed limit in the specification itself. Apple states that iPhone can store 8 or more eSIMs, and profiles can be switched from the device’s Settings app.

SGP.22 v3.0 introduced MEP (Multiple Enabled Profiles) as an optional feature, allowing more than one profile to be active simultaneously on a single eUICC. Android 13 and later support MEP-A1; Android 14 and later additionally support MEP-B. This enables eSIM-only dual SIM devices without a physical SIM slot.

GSMA Specifications at a Glance

Benefits of eSIM

Instant Activation — No Waiting for a Card

With a physical SIM, you wait for a card to arrive by post, which can take several days. With eSIM, once a carrier approves your application, you download the profile and start using your plan within minutes. This is especially useful when you need connectivity immediately — at an airport, upon arriving in a new country, or after switching carriers on a weekend.

Easier Dual SIM

Most eSIM-capable smartphones support dual SIM: one physical SIM slot plus one eSIM, or two eSIMs simultaneously. This means you can keep your primary number active while adding a local data plan for travel, or separate work and personal lines on a single device — without needing two physical SIM slots or swapping cards.

Dual SIM works in two main modes, defined in GSMA TS.37:

• DSDS (Dual SIM Dual Standby): both SIMs receive calls and messages, but only one can transmit data at a time
• DSDA (Dual SIM Dual Active): both SIMs maintain independent network connections simultaneously, at the cost of higher battery usage

Store Multiple Profiles and Switch Freely

You can keep several carrier profiles on your device at once. For example: your home plan, a travel eSIM for Europe, and a separate data eSIM for Asia. Switching between them takes a few taps — no physical card exchange required. iPhone can store 8 or more eSIM profiles according to Apple.

Slimmer Devices and Better Water Resistance

Removing the physical SIM slot gives manufacturers more flexibility to reduce device thickness, improve waterproofing, and use the freed space for battery or other components. The eSIM-only design adopted by iPhone 14 and later (for the US market) is a direct consequence of this trend.

Convenient for International Travel

You can purchase and install a travel eSIM before you leave home, then activate it the moment you land. If your home SIM is also an eSIM, you can run both simultaneously: keep receiving calls and SMS on your home number while using the travel eSIM for data. This dual-SIM setup is also useful for receiving SMS-based two-factor authentication codes from your bank or other services while abroad.

Limitations of eSIM

Re-issue Required When Changing Devices

Because the eSIM chip is soldered inside the device, you cannot physically move it to another phone. If you upgrade, lose, or break your device, you need to contact your carrier to re-issue the eSIM to the new device. Some carriers charge a fee for this, and the process may take longer than simply inserting a physical SIM. Check your carrier’s re-issue policy before you rely on eSIM as your only SIM.

Not All Devices Support eSIM

eSIM support varies by device model, production region, and carrier lock status. Carrier-locked devices may not support eSIM even if the hardware is otherwise capable. Budget Android phones released in 2022 or earlier often lack eSIM support. Always confirm eSIM compatibility on the manufacturer’s official support page before purchasing a plan.

Some eSIM Profiles Cannot Be Reinstalled

Travel eSIM providers and some carriers restrict reinstallation: once you delete a profile, you may not be able to download it again without purchasing a new plan. This is particularly common with travel eSIMs from third-party providers. Before deleting any eSIM profile, confirm the provider’s reinstall policy.

Internet Connection Required for Initial Setup

Downloading an eSIM profile requires an active Wi-Fi or mobile data connection. If you are setting up a new device in a location without connectivity, you cannot activate an eSIM until you have access to the internet. Plan ahead — download your travel eSIM profile before departure, while you still have a reliable Wi-Fi connection.

Supported Devices

iPhone

eSIM support on iPhone starts with the iPhone XS, iPhone XS Max, and iPhone XR (2018 models). All iPhone models released since then support eSIM.

iPhone 13 and later (including iPhone SE 3rd generation) support dual eSIM — two eSIM profiles active at the same time, without needing a physical SIM slot for the second line.

iPhone 14 through iPhone 16e sold in the US are eSIM-only with no physical SIM card slot. Starting with iPhone 17 (2025), eSIM-only models expanded to additional regions: Canada, Mexico, Japan, UAE, Saudi Arabia, Bahrain, Kuwait, Oman, Qatar, Guam, and the U.S. Virgin Islands.

For a full list of eSIM-compatible iPhone models by region, see Apple’s official support page.

Android (Google Pixel)

Google Pixel 3 and later generally support eSIM, though support on Pixel 3 varies by region and carrier variant. Google Pixel 7 and Pixel 7 Pro were the first Android smartphones to support dual eSIM — two eSIM profiles simultaneously active — at launch in October 2022. Pixel 7 and all later Pixel models support dual eSIM. US-market Pixel 10 models are eSIM-only with no physical SIM slot.

Samsung Galaxy S20 and later, as well as flagship models from other Android manufacturers (Motorola, Nokia, and others), also support eSIM on many variants. Availability depends on the region and whether the device is carrier-locked. Always verify on the manufacturer’s support page.

iPad and Tablets

iPad Pro (M4) and iPad Air (M2) are eSIM-only (no physical SIM slot). Earlier iPad Pro and iPad Air models with Wi-Fi + Cellular connectivity generally support eSIM as well. Cellular-capable tablets from other manufacturers increasingly include eSIM support; check device specifications before purchasing.

Summary

To find plans that support eSIM, use the eSIM filter on SimFinder.