Asus ROG Phone 9 Pro 128GB eSIM: compatibility and setup

Quick answer

Asus ROG Phone 9 Pro 128GB may support eSIM, but the “128GB” description is not enough to confirm that this particular handset does. ASUS documents eSIM setup for the ROG Phone 9 family, and its Japanese ROG Phone 9 Pro specifications list two nano-SIM slots plus one eSIM. However, the Global specification page lists two nano-SIM slots, and ASUS’s published configurations do not identify a 128GB ROG Phone 9 Pro variant. The actual answer therefore depends on the phone’s regional SKU, firmware and market—not simply on the name in a shop listing.

Before buying a travel plan, check the device itself for an EID and an eSIM option, then confirm the exact model code and unlocked status with the seller or carrier. If there is no EID and no eSIM setup option, treat the phone as incompatible even if a listing or a general family guide says otherwise.

What the name tells you—and what it does not

The exact description Asus ROG Phone 9 Pro 128GB is retained because its storage modifier is part of the request. Storage does not identify eSIM hardware. ASUS’s published ROG Phone 9 Pro specifications show other capacities, including 512GB for the Japanese Pro model; they do not identify a 128GB configuration. The listing could be shorthand, an error or a different market offer, so do not infer its region from “128GB.”

ASUS identifies ROG Phone 9 and ROG Phone 9 Pro under the AI2501 model family in its eSIM support guidance. That support article describes how to find the EID and set up eSIM, but it also cautions that eSIM functions vary by service provider, country or region and device model. Meanwhile, the Global ROG Phone 9 Pro specifications describe dual SIM standby with two physical nano-SIM slots. The official Japanese specification for the ROG Phone 9 Pro lists “nanoSIM × 2 / eSIM × 1.” These documents do not establish that every AI2501 handset, every country version or every storage listing has identical SIM hardware.

Check compatibility before choosing a plan

Complete these checks while you still have access to the seller, the original box and a reliable internet connection. Menu names can vary slightly with region, Android version and ASUS software updates.

• Find the model code. Open Settings → About phone and record the model number and software build. Compare the full code—not only “ROG Phone 9 Pro”—with the seller’s invoice, box label and the ASUS support page for the market where it was sold.
• Look for an EID. In Settings, search for “EID” or inspect About phone → Status (the path can differ). ASUS says its setup guide uses the EID to identify a built-in eSIM chip; if the EID cannot be viewed, its guidance says the phone does not support that feature. You may also be able to open the phone dialler and enter *#06#; if the handset exposes an EID, it may be shown with the IMEI details. Do not post the EID publicly. It is an identifier used for eSIM provisioning.
• Check the SIM settings. Open Settings → Network & internet → SIM card or search Settings for “SIM.” Look for Add eSIM, Download a SIM, Switch SIM type, or an option to change SIM 2 to eSIM. ASUS’s ROG Phone 9 setup steps describe Network & internet → SIM card → Switch SIM type → eSIM on supported builds. Availability of the menu is software- and region-dependent.
• Ask the seller or carrier to confirm the SKU. Ask whether this exact unit has a built-in eSIM, which regional model code it uses, whether it is network-unlocked and whether eSIM is enabled in its current firmware. Request a written answer if the listing is ambiguous.
• Confirm the travel plan’s requirements. The phone must be unlocked and able to use the partner mobile networks and radio bands in your destination. eSIM capability alone does not guarantee local coverage, 5G access or a successful connection.
• Keep the physical SIM situation in mind. ASUS notes that changing SIM 2 to eSIM can disable the physical card in the second slot. Read the on-screen warning before switching; your calling SIM may be in that slot.

Before paying, ask the seller to confirm the complete ASUS product code, country of sale, SIM configuration and whether the phone has been carrier-unlocked. Ask for a clear photo of the About phone screen or the original box label if the listing only says “128GB.” Compare this with the model code shown in Settings after receiving the device; a box, invoice or reseller description can be incomplete. Confirm that any eSIM profile you intend to use is accepted by the current carrier and supported for your destination. Compatibility is a device-and-plan check, so test the handset while you still have time to contact the seller or return it. For a second device check, check whether your device is compatible before you choose or pay for a travel plan. If the seller cannot verify the SKU and your handset has no EID, assume it cannot install an eSIM. A QR code cannot add eSIM hardware or unlock a carrier-restricted phone.

What regional and carrier versions can change

The official documents show regional variation: the Japanese page lists eSIM while the Global page lists two nano-SIM slots. A family-level setup guide does not promise that every region has the required eSIM hardware. Radio bands, software options and carrier acceptance may also differ by market.

A carrier can add another layer. A handset may have eSIM hardware but still be locked to its original network, restricted by an operator policy, or unable to download a particular provider’s profile. Conversely, a roaming or data plan provider cannot activate eSIM on hardware that lacks an EID. Ask the current carrier to confirm that the device is unlocked and that third-party travel profiles are allowed. If you bought the phone used, verify this before leaving your home network.

Do not confuse three different checks:

1. Hardware capability: EID and eSIM controls are available on the device.
2. Carrier permission: the handset is unlocked and the original carrier permits another profile.
3. Plan and destination compatibility: the eSIM provider’s plan supports your destination, device and intended use.

All three must line up: a suitable plan cannot compensate for a physical-SIM-only version or a carrier lock.

Install and activate eSIM on a supported ROG Phone 9 Pro

Install the profile over a stable Wi-Fi connection before travel, or use another trusted connection after arrival. Keep the QR code available on a second screen or printed page if the phone cannot scan a QR code displayed on itself. Follow the plan’s own activation instructions: downloading a profile, turning on the eSIM line and starting the plan’s validity period may be separate events.

1. Check the model and EID again. Confirm that Settings displays the EID and that the SIM page offers an eSIM action. Update Android and ASUS system components if an update is available, then restart and check the menu again. An update cannot add a missing eSIM chip, but it may change the settings interface on supported hardware.
2. Choose a plan for the destination. Check the country or region, data allowance, validity period, supported network, activation conditions and whether tethering is allowed. Make sure the plan is for mobile data if that is what you need. A travel data eSIM normally does not replace your regular phone number; voice calls and SMS are included only when the specific plan says so.
3. Open the eSIM setup screen. On a supported ASUS build, follow the path shown by ASUS: Settings → Network & internet → SIM card → Switch SIM type → eSIM. Some versions may display Add eSIM or a similar option instead. The available path can vary; use the label on your screen and do not force a SIM-type change if the phone does not show it.
4. Read the SIM 2 notice. ASUS warns that converting SIM 2 to eSIM can disable the physical SIM in that slot. Confirm that you understand which line will be affected and that you can restore your preferred arrangement if needed. If you rely on two physical SIM cards, pause and confirm how your variant handles the change before proceeding.
5. Download the profile. Scan the QR code supplied after you select a plan, or enter the activation details manually if the provider offers that option. Keep the screen awake and the internet connection stable. Do not scan the same one-time QR code repeatedly or delete a partially installed profile unless the provider tells you to; some activation codes cannot be reused.
6. Name the line and choose its role. Give the new profile a clear label such as “Travel data.” Keep your usual number as the default for calls and texts if you want to continue receiving them. Set the travel eSIM as the mobile-data line only when you are ready to use it and the plan’s instructions say to do so.
7. Activate at the right time. Some plans begin when installed; others start on first connection to a supported network or when manually activated. Check the plan conditions before installing early. If it is meant to start at your destination, leave it installed but off until then only if the provider permits this.
8. Enable roaming only as instructed. Some travel eSIMs require data roaming on for the travel line. Turn it on for that profile only when the plan says it is needed, and keep data roaming off for your home SIM if you want to avoid unintended roaming charges. Confirm the selected mobile-data SIM before enabling roaming.
9. Test the connection. Once the plan should be active and you are in a supported destination, turn Wi-Fi off briefly, check for a mobile network and open a simple webpage. If data does not work, verify the selected data SIM, the plan status, roaming setting and any APN details provided by the plan.

ASUS’s generic eSIM support guide may show screens and wording that differ from your software version. For a general Android walkthrough, see the Android eSIM installation instructions; that guide notes its screenshots are specific to Samsung, so use the ASUS settings labels above for this phone. The iOS eSIM installation instructions are included as a reference for anyone setting up a different Apple device; they do not apply to the ROG Phone 9 Pro.

Use the travel eSIM for mobile data

Before departure, decide which line handles each service. You may keep the home SIM for calls and texts and select the travel eSIM for data, subject to the device’s regional SIM mode. Check the SIM manager after switching SIM 2 to eSIM.

At your destination, select the travel profile under Mobile data and enable roaming for that profile only if required. Keep automatic network selection on unless the provider advises otherwise. Access depends on the plan, local network and handset; confirm each country on a multi-stop itinerary is included.

Keep an eye on the plan’s data and validity. Navigation, messaging and maps can use background data, so download essential travel information over Wi-Fi before leaving. The phone’s data counter may not match the provider’s billing interval; check remaining usage and validity in the plan account where available.

If you need your usual number for calls or SMS, check roaming conditions with your home carrier. A data-only travel plan typically does not supply a standard phone number; app-based calls require an active internet connection.

Kaspersky eSIM Store is an app and website where you can choose, arrange and activate an eSIM with a mobile-data plan for an overseas trip. Check the exact plan conditions for your destination and device before purchase; availability, data allowance and validity depend on the selected plan. Keep your regular SIM’s roaming settings and charges in mind when using two lines.

Common problems and what to check

There is no EID or eSIM option

Search Settings for “EID” and “SIM,” check the full model code and region, then restart after any available system update. If there is still no EID and no eSIM setup option, treat the handset as a physical-SIM-only version. Ask ASUS or the seller to confirm its SKU; do not buy a plan expecting a QR code to add missing hardware.

The profile will not download or activate

Use reliable Wi-Fi, check that the QR code belongs to the selected plan, and make sure it has not already been used. If scanning fails, try manual details only when the provider supplies them. If a code is marked used or the profile installed only partly, ask the provider about a reset before deleting anything. Some codes are single-use.

The eSIM shows no service or data

Confirm that the plan should already be active and covers your location. Select the travel profile for mobile data, enable data roaming only if the plan requires it, and enter an APN only when the provider gives you one. Toggle airplane mode or restart, then check network selection and data allowance. Signal bars alone do not confirm that the data plan is active.

The regular SIM stopped working

Review the SIM 2 notice and current line settings. ASUS says switching SIM 2 to eSIM can disable the physical SIM in that slot. Restore the physical SIM mode if available and contact your home carrier if you need calls, SMS or verification codes. Do not delete a working travel profile as a first troubleshooting step; reinstallation may require a new activation code.

Practical travel scenarios

One destination: check compatibility, install over Wi-Fi and enable the profile according to its start rules. At the destination, select it for mobile data; keep your home number available only if your carrier’s conditions suit you.

Several countries: verify every stop is covered, check validity and network selection rules, and compare another plan if the route is not included.

A phone bought abroad or used: check the SKU and EID and confirm it is unlocked. A “global version” label or factory reset does not change SIM hardware; test while you can still return the device.

Frequently asked questions

Does Asus ROG Phone 9 Pro 128GB support eSIM?

The 128GB listing alone cannot confirm it. ASUS’s Japanese Pro specification lists eSIM; its Global specification lists two nano-SIM slots. Check the handset’s EID, SIM settings and regional model code.

Does ASUS’s setup guide prove that all regional versions support eSIM?

No. The family guide explains setup, but ASUS says support varies by provider, region and model. Confirm the EID on your own phone.

Can eSIM work with two physical SIMs, and can I transfer it later?

Do not assume that both physical SIMs remain usable: ASUS warns that switching SIM 2 to eSIM can disable its physical card. Transfer or QR reuse depends on the profile provider, so check its terms before deleting or moving a profile.

When should I activate a travel eSIM?

Follow the plan’s start rules. Validity may begin at installation, manual activation or first network connection. Check before scanning the QR code.

Final checklist: verify the phone, then choose the trip plan

For Asus ROG Phone 9 Pro 128GB, do not let a storage label stand in for a compatibility check. Confirm the exact regional model code, look for the EID and an eSIM setup option, verify that the phone is unlocked, and check whether switching SIM 2 changes your physical-SIM arrangement. If any of those checks is unclear, ask ASUS, the seller or your carrier before purchasing a plan.

Once confirmed, choose a destination plan by checking coverage, data allowance, validity and activation rules. Kaspersky eSIM Store’s app and website let you browse, arrange and activate an eSIM with a mobile-data plan for an overseas trip. Browse current travel plan options and review the conditions for your destination. If the phone has no EID, use a compatible physical SIM or another unlocked eSIM-capable device.