If you have bought a phone in the last few years, you have probably seen the term "eSIM" on the spec sheet. The technology has gone from niche curiosity to mainstream standard since Apple removed the physical SIM tray entirely from U.S. iPhone 14 models in 2022. By 2026, the GSMA reports that over 6 billion eSIM-capable devices are in active use worldwide, spanning smartphones, tablets, smartwatches, and laptops. This guide breaks down exactly what an eSIM is, how the underlying technology works, and why it matters for everyday phone users and international travelers alike.
Step-by-step instructions
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The embedded chip on your phone's motherboard
Every eSIM starts with a tiny piece of hardware called an eUICC (embedded Universal Integrated Circuit Card). This chip measures roughly 5mm x 6mm and is soldered directly onto the phone's logic board during manufacturing. Unlike a removable nano SIM card that you pop in and out of a tray, the eUICC stays permanently inside the device. The chip itself does not belong to any carrier. It is a blank, reprogrammable module that can store multiple carrier profiles simultaneously. Apple's latest eUICC chips can hold up to eight carrier profiles at once, while most Android implementations support at least five. The physical hardware is standardized by the GSMA under specification SGP.22, which means every eSIM chip follows the same protocol regardless of whether it sits inside a Samsung Galaxy, Google Pixel, or Apple iPhone. Because the chip is factory-installed, it cannot be lost, damaged by moisture in the SIM tray, or accidentally ejected. This permanence is one reason phone manufacturers have embraced the technology: removing the SIM tray frees up internal space for larger batteries or improved water resistance seals.
Tip: The eUICC chip is not the same as an iSIM (integrated SIM), which embeds SIM functionality directly into the phone's main processor. iSIM is an emerging standard expected to appear in more devices by 2027.
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Downloading a carrier profile over the air
When you "activate" an eSIM, you are actually downloading a carrier profile from a remote server called SM-DP+ (Subscription Manager Data Preparation). This profile contains the same data that would normally be burned onto a physical SIM card: your IMSI (International Mobile Subscriber Identity), authentication keys, network access credentials, and operator-specific configurations. The download process uses a secure, encrypted channel between your phone and the SM-DP+ server. Most providers deliver this profile through a QR code that encodes the server address and a one-time activation code. When you scan the QR code with your phone's camera, the device contacts the SM-DP+ server, authenticates the request, and pulls the profile down over Wi-Fi or an existing cellular connection. The entire transfer is typically between 50KB and 200KB of data, so it completes in under 30 seconds on most connections. Some providers skip the QR code entirely and push the profile through their mobile app, which handles the server communication behind the scenes. Either way, the result is the same: a complete carrier identity stored securely on your eUICC chip.
Tip: You need an internet connection (Wi-Fi or existing cellular data) to download an eSIM profile. Download your travel e-sim before you leave home so you are not scrambling for Wi-Fi at the airport.
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Carrier activation and network registration
Once the carrier profile lands on your eUICC, the phone treats it exactly like a physical SIM card inserted into the tray. The device reads the IMSI and authentication keys from the profile and begins the network registration process with the carrier's Home Location Register (HLR) or Home Subscriber Server (HSS). This registration follows the same 3GPP standards used by physical SIMs, so the network cannot distinguish between an eSIM connection and a traditional SIM connection. Your phone receives a phone number (if the plan includes one), registers on the carrier's preferred network bands, and establishes a data session. For travel eSIMs specifically, this registration often involves connecting to a local partner network through a roaming agreement. Providers like Airalo and Saily use wholesale agreements with in-country carriers, so your eSIM profile authenticates against a home network that then roams onto the local infrastructure. The latency of this activation step varies: some carriers complete registration in under 60 seconds, while others (particularly in regions with older network infrastructure) may take 5 to 15 minutes. After activation, you can toggle the eSIM on and off, switch between stored profiles, or delete the profile entirely, all from your phone's settings menu without touching any physical hardware.
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Managing and switching between stored carrier profiles
One of the most practical advantages of the e-sim standard is the ability to store and manage multiple carrier profiles on a single device. On iPhone, every installed eSIM profile appears under Settings > Cellular with a label, carrier name, and an on/off toggle. You can keep two profiles active simultaneously on iPhone 13 and later, with the rest held in storage ready to switch on in seconds. This makes it easy to pre-load a travel eSIM for an upcoming trip while keeping your home carrier active as the primary data line. Switching between profiles takes roughly 10 seconds: tap the stored profile in Settings > Cellular, toggle it on, then set it as your cellular data source under the Cellular Data menu. No QR code re-scan needed, no carrier call required. The phone completes network re-registration in under 60 seconds on most carriers. On Samsung Galaxy (Settings > Connections > SIM Manager), each stored profile displays with toggles for calls, texts, and data. Samsung lets you configure automatic rules, such as always routing data through a specific profile when connected to certain networks. Google Pixel manages stored profiles under Settings > Network & internet > SIMs, with a clear visual indicator showing which SIM currently handles data. For frequent travelers, a practical strategy is maintaining your home carrier as a permanent active eSIM while installing destination-specific travel profiles as needed. After a trip, you can either delete the travel eSIM to free a storage slot or keep it installed for return visits since most eSIM plans store the profile indefinitely even after the data allowance expires. Label each profile clearly, such as 'Japan 2026' or 'Europe Data', so you can identify the right line instantly when toggling between profiles at borders or when reconfiguring your data line mid-trip.
Tip: On iPhone, you can rename any eSIM line to a custom label in Settings > Cellular > (select the line) > Change Label. Clear naming prevents confusion when you have three or four travel profiles stored at once.
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Deleting an eSIM profile and what happens to your plan
Deleting an eSIM profile removes the carrier credentials from your eUICC chip permanently. On iPhone, go to Settings > Cellular, tap the eSIM line you want to remove, scroll to the bottom, and tap 'Delete eSIM.' On Android, go to Settings > Network & internet > SIMs, select the profile, and choose 'Delete.' The deletion completes in seconds with no internet connection required. For travel eSIM plans from providers like Airalo, Saily, or Nomad, deleting the profile makes any remaining data on that plan inaccessible from your device. The plan itself is not automatically cancelled or refunded. Most providers allow you to re-download a deleted profile from your account dashboard or app, but this requires a new QR code and is subject to the provider's re-download policy. Some providers allow one free re-download; others treat deletion as final and require purchasing a new plan. For carrier eSIM plans (your primary phone number), deletion works differently. Deleting the profile does not cancel your carrier contract or terminate your service. Your carrier can reprovision the same subscriber identity onto your device using a new QR code, typically within 24 hours of requesting it through their support team or app. Your phone number remains assigned to your account. If you are switching phones and want to move an e-sim profile, do not delete it first. Use Apple's Quick Transfer (iOS 17.4+) or contact your carrier to migrate the profile, as deletion before transfer forces a full re-provisioning process. Before deleting any profile, confirm whether your provider supports re-downloads and whether any unused data credit carries over to a reinstalled plan.
Tip: Take a screenshot of any active eSIM's QR code email before deleting the profile. If you cannot re-download from the provider's app, the original QR code may still be valid for reinstallation on the same device.
How Is an eSIM Different from a Physical SIM?
The core function is identical: both authenticate your device on a mobile network and store your subscriber identity. The differences are entirely in form factor, flexibility, and logistics. A physical SIM card is a removable plastic card (standard, micro, or nano size) that carries a single carrier profile burned onto its integrated circuit.
You need a SIM ejector tool to swap it, and if you lose the card, you lose your number until the carrier issues a replacement. An eSIM eliminates the removable card entirely. The chip is built in, and profiles are managed through software.
This means you can switch carriers in under two minutes without visiting a store or waiting for a card in the mail. You can also store multiple profiles and toggle between them, something impossible with a single physical SIM slot. From a durability standpoint, eSIMs are more reliable.
S. models. The SIM tray also consumes roughly 120 cubic millimeters of internal space that manufacturers can reallocate to battery capacity or haptic motors.
One functional difference worth noting: physical SIM cards can be transferred between devices instantly by moving the card. Transferring an eSIM between devices requires deactivating the profile on one device and reactivating it on the other, a process that varies by carrier and can take anywhere from 2 minutes to 24 hours depending on the operator's systems.
Which Phones Support eSIM in 2026?
eSIM support has expanded rapidly since Apple first introduced it in the iPhone XS in 2018. As of 2026, the following major device families include eSIM capability. On the Apple side, every iPhone from the XS onward supports eSIM, including the iPhone 14, 15, 16, and 17 series.
S. iPhone 14 and later models are eSIM-only with no physical SIM tray. The Apple Watch Series 3 and later, every iPad Pro and iPad Air since 2018, and all iPad mini models from the 5th generation onward also support eSIM.
Samsung offers eSIM on the Galaxy S21 and newer (S22, S23, S24, S25 series), the Galaxy Z Flip 3 and newer, the Galaxy Z Fold 3 and newer, and select Galaxy A-series models in certain markets. Google has included eSIM in every Pixel phone since the Pixel 2 (2017), making it one of the earliest Android adopters. The Pixel 7, 8, and 9 series all support dual eSIM configurations.
Motorola supports eSIM on the Razr (2022 and later) and Edge 40 Pro and newer models. OnePlus added eSIM to the OnePlus 12 and later devices. Sony includes eSIM in the Xperia 1 V and 1 VI.
On the laptop and tablet side, Microsoft Surface Pro models from 2019 onward, select Lenovo ThinkPad X1 Carbon models, and HP Elite Dragonfly notebooks all include eSIM. The total count of eSIM-compatible device models exceeded 1,200 by early 2026 according to GSMA Intelligence data. To check whether your specific device supports eSIM, visit your phone's settings: on iPhone, go to Settings > Cellular > Add eSIM; on most Android devices, go to Settings > Network & internet > SIMs.
What Are the Advantages of eSIM for Travelers?
International travel is where eSIM technology delivers its most tangible benefits. S. carriers), buy a local physical SIM card at the airport (requiring passport registration, language barriers, and SIM tray swaps), or rely entirely on hotel and cafe Wi-Fi.
eSIM eliminates most of these friction points. First, you can purchase and install a local data plan before your flight even departs. Providers like Airalo, Saily, and Nomad eSIM sell destination-specific plans that you download over your home Wi-Fi.
The moment your plane lands and you turn off airplane mode, your phone connects to the local network automatically. Second, pricing is significantly more competitive than carrier roaming. A 10GB eSIM plan for Japan costs between $8 and $15 from most providers, compared to $100+ for the same data through AT&T or Verizon international roaming passes.
Third, dual SIM functionality means you can keep your home number active for calls and texts on your physical SIM (or primary eSIM) while routing all data through your travel eSIM. This avoids the problem of missing important calls while abroad. Fourth, multi-country trips become dramatically simpler.
Instead of buying a new physical SIM at each border crossing, you can pre-load eSIM profiles for every country on your itinerary. Regional eSIM plans covering areas like Europe (40+ countries), Southeast Asia, or Latin America let you cross borders with a single plan. Fifth, there is no risk of losing a tiny physical SIM card in a foreign country.
Your travel plan lives on the embedded chip and can be deleted when you return home.
Can You Have Both a Physical SIM and eSIM?
Yes, and this dual SIM configuration is one of the most practical features of eSIM technology. Most eSIM-capable phones released between 2018 and 2024 include one physical nano SIM slot alongside the embedded eSIM chip, allowing you to run two separate cellular plans simultaneously. On these devices, you designate one line as the "primary" (typically your main phone number for calls and texts) and the other as the "secondary" (often used for data only).
You can configure which line handles outgoing calls, which handles SMS, and which provides cellular data, all from the phone's settings menu. ), which support dual eSIM, meaning you can run two eSIM profiles simultaneously without any physical SIM card at all. S.
iPhone 14 and later models are eSIM-only and support two active eSIM lines concurrently, with up to eight total profiles stored on the chip. Samsung Galaxy S24 and S25 series devices also support dual eSIM alongside a physical SIM slot, effectively enabling triple SIM capability (though only two lines can be active at any given time). Practical use cases for dual SIM include: keeping a personal and work number on one phone, maintaining your home number while using a local data plan abroad, separating voice and data across different carriers for better coverage, and using a low-cost data plan from one carrier alongside a voice plan from another.
The only limitation is that both lines share the same radio hardware, so if one line is on a call using the voice network, the other line's data throughput may be temporarily reduced on older devices. iPhone 12 and later models with 5G support handle this more gracefully through DSDS (Dual SIM Dual Standby) improvements.
Frequently asked questions
Is an eSIM the same as a SIM card?
An eSIM performs the same function as a physical SIM card: it authenticates your device on a mobile network and stores your subscriber identity. The difference is form factor. A physical SIM is a removable plastic card, while an eSIM is a chip permanently embedded in your phone's motherboard. Both use the same underlying UICC technology standardized by GSMA.
Does using an eSIM cost extra?
The eSIM hardware itself costs nothing extra since it is built into your phone. The plans you purchase for an eSIM are priced the same as (or cheaper than) physical SIM plans. Travel eSIM providers typically charge between $4 and $50 depending on the destination, data allowance, and validity period. Your existing carrier may also let you convert your current plan to eSIM at no charge.
Can I transfer my eSIM to a new phone?
Yes, but the process varies by carrier. Apple offers a quick transfer feature for iPhones running iOS 16 or later that moves your eSIM profile between devices via Bluetooth in about two minutes. For other carriers, you may need to contact support to deactivate the profile on your old device and reissue a new QR code for the new one. Travel eSIMs from providers like Airalo and Saily are generally single-device and cannot be transferred once installed.
How many eSIM profiles can I store on my phone?
Most modern iPhones (iPhone 13 and later) can store up to eight eSIM profiles, though only two can be active simultaneously. Samsung Galaxy S24 and S25 devices support up to five stored profiles with two active. Google Pixel 8 and 9 series support up to seven stored profiles. The exact limthe answer varies by on your device model and the eUICC chip's memory capacity.
Will my phone number change if I switch to eSIM?
No. When you convert your existing plan from a physical SIM to an eSIM with the same carrier, your phone number stays the same. The carrier simply reprovisions your subscriber identity onto the embedded chip. If you purchase a separate travel eSIM from a third-party provider, that plan comes with its own number (or is data-only with no number), but your primary number on your main line remains unchanged.
Do eSIMs work on prepaid plans?
Yes. Most travel eSIM providers operate on a prepaid model where you pay upfront for a fixed amount of data and validity period. Major U.S. carriers including T-Mobile, AT&T, and Verizon also offer prepaid eSIM plans. In fact, prepaid is the most common eSIM use case globally, with the GSMA estimating that over 70% of eSIM activations in 2025 were prepaid rather than postpaid.
Is eSIM more secure than a physical SIM?
eSIM is more secure than a physical SIM for most users. The embedded chip cannot be removed and placed in another device for SIM cloning, and remote provisioning uses end-to-end TLS encryption between the device and the carrier's SM-DP+ server. SIM swap fraud is also harder because transferring an eSIM profile requires authentication through the carrier's systems, not just possession of the physical card. The FBI reported SIM swap fraud caused $68 million in losses in 2023.
How many eSIM profiles can one phone store?
iPhone 13 and later models store up to eight eSIM profiles with two active at once. Samsung Galaxy S24 and S25 devices hold up to five profiles. Google Pixel 8 and 9 series support up to seven stored profiles. The storage limit comes from the eUICC chip's onboard memory capacity, which varies by manufacturer. Only two profiles can run simultaneously on any of these devices regardless of total storage.
Is eSIM more secure than a physical SIM card?
eSIM delivers stronger security in three specific ways. First, the chip cannot be physically removed and inserted into another device, eliminating SIM card theft as an attack vector. Second, profile transfers require authentication through the carrier's SM-DP+ server with TLS encryption, making SIM swap fraud significantly harder. Third, physical SIM cards can be cloned with USIM reader hardware if an attacker gains temporary access. The FBI's 2023 data shows SIM swap attacks caused $68 million in verified losses.
Can I use an eSIM on a tablet or smartwatch?
Yes. eSIM is widely supported on tablets and smartwatches beyond smartphones. Every iPad Pro since 2018, iPad Air since 2022, and iPad mini from the 5th generation onward includes eSIM. Apple Watch Series 3 through Series 10 all have eSIM for cellular connectivity without your iPhone nearby. Samsung Galaxy Watch 4, 5, 6, and 7 support eSIM. Google Pixel Watch 1 and 2 include eSIM as well. Plan pricing for tablets and watches varies by carrier.
What happens to my eSIM if I factory reset my phone?
A factory reset deletes all eSIM profiles stored on your device along with other data. For travel eSIM plans from providers like Airalo, Saily, or Nomad, any unused data becomes inaccessible and you will need to contact the provider for a replacement QR code. For carrier eSIM plans (your primary phone number), your carrier can reissue the profile after a reset, though this may take up to 24 hours. Always export a backup of your QR codes before performing a factory reset.
Does eSIM work in every country?
eSIM works in most developed markets, including the United States, Canada, most of Europe, Japan, South Korea, Australia, and India. Significant gaps remain in parts of sub-Saharan Africa, Central Asia, and some Pacific Island nations where carriers have not built out SM-DP+ provisioning infrastructure. China is a notable exception: domestic phones sold in mainland China typically do not support eSIM even when the hardware is present, due to regulatory restrictions. Always verify coverage for your specific destination on your provider's country list before purchasing.
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