Can Honor 400 do eSIM?

Yes, the Honor 400 can do eSIM. It supports one active eSIM alongside one physical nano-SIM, giving you dual-SIM functionality. You can use the eSIM for a second phone number or a travel data plan while keeping your primary SIM in the physical slot. The device does not support two eSIMs simultaneously.

What is the downside of eSIM?

The main downside of eSIM is that you can't instantly swap it into another phone the way you would pop out a physical SIM card. If your Honor 400 breaks or you upgrade devices, you'll need to contact your carrier to transfer the eSIM profile, which can take a few minutes to a few hours depending on the provider's process.

Why is eSIM not popular?

eSIM adoption has been slower in some regions because not all carriers support it yet, and many people are simply unfamiliar with the technology. Physical SIM cards have been the standard for decades, so habits take time to change. However, eSIM use is growing rapidly, especially for travel data and secondary lines, as more devices and networks come online.

Which eSIM is best for the USA?

The best eSIM for the USA depends on how much data you need and how long you're staying. Look for plans that use major networks like T-Mobile, AT&T, or Verizon for reliable nationwide coverage. Compare data allowances, validity periods, and whether the plan includes hotspot support. You can compare dozens of USA eSIM options and install one directly on your Honor 400 before you travel.

Does the Honor 400 support dual eSIM?

No, the Honor 400 does not support dual eSIM. You can only have one eSIM active at a time, alongside one physical nano-SIM. The device can store multiple eSIM profiles, and you can switch between them in settings, but you cannot run two eSIMs simultaneously. This is the same limitation found on most phones with hybrid SIM configurations.

Honor 400 eSIM — Compatibility & Setup

Does the Honor 400 support eSIM?

Honor 400 eSIM compatibility

Yes, the Honor 400 supports eSIM. The device features a Nano-SIM + eSIM configuration, which means you can use one physical nano-SIM card alongside one eSIM profile simultaneously. This dual-SIM setup gives you the flexibility to maintain two separate phone numbers or data plans on a single device.

The Honor 400 eSIM support applies to the standard model. You can use the physical SIM slot for your primary line while activating an eSIM for a secondary number, or vice versa. This configuration is particularly useful for separating work and personal lines, or adding a local data plan when you travel without removing your home SIM card.

Dual SIM functionality

The Honor 400 does not support dual eSIM—you cannot run two eSIM profiles at the same time. You're limited to one active eSIM plus one physical nano-SIM. If you need to switch between multiple eSIM profiles (for example, different travel destinations), you can store several eSIM profiles on the device and toggle which one is active through the settings menu.

How to set up an eSIM on the Honor 400

Honor 400 eSIM activation steps

Setting up an eSIM on your Honor 400 takes about 60 seconds once you have your QR code from your carrier or eSIM provider. Make sure you're connected to Wi-Fi before you begin, as the device needs to download and authenticate your eSIM profile.

Open Settings on your Honor 400.
Tap Mobile Network or SIM & Network.
Select SIM Management.
Tap Add eSIM or Add Mobile Plan.
Choose Scan QR Code and point your camera at the QR code provided by your carrier or eSIM service.
Confirm the details and tap Add or Download.
Wait for the eSIM profile to install—this usually takes 30–60 seconds.
Label your line (e.g., "Travel Data" or "Work") to distinguish it from your physical SIM.
Choose which line to use for mobile data, calls, and messages in the SIM settings.

Set up an eSIM in Settings

After installation, your Honor 400 will show both SIM lines in the status bar. You can assign default roles to each line: for example, set your physical SIM as the default for calls and SMS, and your eSIM as the default for mobile data. You can change these assignments anytime in the SIM Management menu.

Using a travel eSIM on the Honor 400

Avoid roaming charges abroad

A travel eSIM is an easy way to get mobile data in another country without paying international roaming fees. Instead of buying a physical SIM card at the airport or relying on your home carrier's expensive roaming rates, you can install a regional or country-specific eSIM before you leave home. Your Honor 400 will use the eSIM for data while your original SIM stays active for calls and texts.

Install your travel eSIM while you're still on Wi-Fi—ideally a day or two before your trip. Most travel eSIMs activate when they detect the destination network, so you'll have data the moment you land. You can browse eSIM plans for hundreds of destinations, compare coverage and data allowances, and install the profile in minutes.

Keep your home number for calls and texts

Because the Honor 400 supports a physical SIM and an eSIM at the same time, your home number remains reachable for voice calls and SMS (including two-factor authentication codes) while the eSIM handles data. This setup is more convenient than swapping SIM cards and eliminates the risk of losing a tiny plastic card while traveling.

Tips & troubleshooting

Turn on data roaming for the eSIM line

Even though you're using a local or regional eSIM, you may need to enable data roaming in your Honor 400 settings for the eSIM line to connect. Go to Settings > Mobile Network > Mobile Data, select your eSIM line, and toggle Data Roaming on. This is normal—the eSIM is technically "roaming" on a foreign network even though you're paying for local data.

What to do if the QR code won't scan

If your camera can't read the QR code (due to glare, poor print quality, or a scratched screen protector), choose Enter Activation Code Manually during setup. Your eSIM provider will supply an SM-DP+ address and activation code that you can type in instead. Make sure you copy the details exactly, including dashes and capitalization.

Managing multiple eSIM profiles

The Honor 400 can store several eSIM profiles, but only one can be active alongside your physical SIM. To switch between stored profiles, go to SIM Management, tap the eSIM you want to activate, and toggle it on. The previously active eSIM will deactivate automatically. This feature is useful if you travel frequently to the same regions and want to keep each destination's eSIM on file. If you need to check another device's eSIM compatibility for a family member or second phone, you can confirm support for other models as well.

Keep your home SIM active for two-factor authentication

Leave your physical home SIM enabled even when using an eSIM for data. Many banking apps, email services, and social media platforms send verification codes via SMS to your primary number. With both SIMs active, you'll receive these codes without interruption while the eSIM provides data connectivity.

Honor 400 eSIM