An eSIM, or embedded Subscriber Identity Module, is basically an electronic version of the regular SIM card that you can find inside any mobile device. The concept of an eSIM is that it is essentially an IC, whose SIM is embedded into the mobile device’s motherboard, making it programmable. It is basically an IC that allows you to connect your mobile device to a cellular network without the use of SIM card.

• eSIM stores the same information as a physical SIM: your phone number, network authentication keys, and carrier profile.
• It can be activated remotely over the air (via QR code, app, or carrier software), making it reprogrammable.
• Most modern smartphones (e.g., iPhone 14 and later in some regions, recent Samsung Galaxy, Google Pixel) support eSIM, often alongside a physical SIM slot for dual-SIM functionality.
• Unlike physical SIMs, eSIMs follow standards like GSMA's eUICC for secure remote provisioning.

In short, eSIM replaces the need for swapping physical cards when changing carriers, plans, or devices.

How to transfer NTC SIM to eSIM Online in Nepal ?

Nepal Telecom (NTC) has supported eSIM since late 2022, and as of 2025–2026, you can convert your existing physical NTC SIM to eSIM online via their portal or app (no need to visit a counter for the request, though issues may require in-person help).

Prerequisites:

• Your phone must support eSIM (check by dialing *#06# if an EID number appears, it's compatible).
• Your NTC profile must be updated (with citizenship details verified).
• Main balance ≥ Rs. 50 (Rs. 50 is charged for conversion; often free or low-cost for existing users).
• Active NTC number.

Step-by-Step Online Process:

• Visit the official NTC eSIM portal: https://esim.ntc.net.np (or through the Nepal Telecom app → eSIM section).
• Enter your NTC mobile number and verify with OTP (sent to your current physical SIM).
• Submit details: Upload a clear live photo (not from gallery) holding your citizenship certificate for verification.
• Charges Rs. 50 (deducted from balance) and submit the request.
• Wait for approval: You'll get an SMS saying "Your request for eSIM has been accepted" (may take minutes to hours).
• Important: Switch to Wi-Fi (do NOT use your NTC mobile data for the next steps).
• Log back into the portal on Wi-Fi.
• Download/activate the eSIM profile (usually via QR code displayed).
• On your phone:
• iPhone: Settings → Cellular → Add eSIM → Scan QR code or use carrier activation.
• Android: Settings → Network & Internet → Mobile Network → Add Carrier → Scan QR code.
• Once activated, your physical SIM deactivates, and the eSIM takes over (you'll get a confirmation SMS).
• If issues arise (e.g., no connection), visit the nearest NTC counter.
• For new numbers: Similar process, but may cost more (equivalent to new physical SIM + Rs. 50).
• Alternative: Use Khalti app for new eSIM purchases.

Advantages of eSIM (Embedded SIM)

• Convenience and Flexibility: It is possible with eSIM to go from one carrier to another, switching plans without having to physically change a SIM card; you can simply activate or change networks digitally.
• Space-Saving Design: Because eSIMs are directly integrated into your devices, they free up space inside your phones, tablets, and wearables, thus allowing sleeker and more compact designs.
• Durability: Without a physical SIM card slot, devices are less vulnerable to dust and water exposure and physical damage; thus, they can be more durable.
• Multiple Profiles: The fact that eSIMs store several carrier profiles at once makes it easier to switch between personal and business numbers or different regional networks.
• Remote Activation: It enables carriers to activate or manage eSIM profiles remotely. That makes the process much easier on the part of the user.
• Environmental Benefits: These result from a reduction in plastic and packaging wastes from physical SIM cards, which helps in environmental sustainability.

Disadvantages of eSIM

• Compatibility Issues: There are limitations in terms of compatibility, as not all devices are equipped with the capability to use the eSIM.
• Carrier Restrictions: Carriers could have restrictions over e-SIM plans or network switching, which might not be as flexible compared to physical SIM cards.
• Hard to Switch Devices: When it comes to eSIM, since it is embedded, the process of switching the service from the old device to the new one becomes difficult.
• Privacy and Security Issues: Though eSIM technology can add to the security benefits, issues such as distant activation and control can result in increased vulnerabilities, if they are not properly secured.
• Limited User Control: Users may possess less control over their eSIMs because their activation might be performed by third-party manufacturers or telecommunication services.
• Compatibility with Older Networks: Sometimes, in certain areas or networks, the availability of the new technology, which is the eSIM, might be restricted or even not available. 
• Software Problem Potential: Software associated with eSIM management may have bugs or glitches that may affect how the eSIM works.

This process is fully digital for conversions, making it convenient. NTC recommends enabling VoLTE (*444*2#) for better call quality. For support, call 1498.