Samsung Galaxy S25 Ultra 128GB eSIM: compatibility and setup

Short answer: Samsung lists the Galaxy S25 Ultra family as eSIM-capable, and regional Samsung specifications describe SIM 1 + eSIM and Dual eSIM configurations. However, the official S25 Ultra storage options I checked are 256GB, 512GB and 1TB; I could not verify an official 128GB S25 Ultra SKU. Keep the exact name Samsung Galaxy S25 Ultra 128GB when identifying your device, but do not treat the storage label as proof of its SIM configuration. Check the actual handset’s model code, EID and Add eSIM option before buying a travel plan. Country of origin, software and carrier restrictions can affect availability.

Samsung’s guidance was checked in September 2026. eSIM availability varies by model, software, origin and carrier.

Samsung Galaxy S25 Ultra 128GB eSIM compatibility at a glance

“128GB” is a storage claim, not an eSIM feature. A listing could contain an error or a mix-up with another Galaxy S25 model. Verify the model code and storage in Settings → About phone and resolve any mismatch with the seller. Samsung’s family-level listing cannot certify every imported or carrier-customized handset; a carrier or plan may also lack eSIM support even when the hardware has it.

Does the Samsung Galaxy S25 Ultra 128GB support eSIM?

The accurate answer is: the Galaxy S25 Ultra family supports eSIM, but I could not confirm an official 128GB S25 Ultra configuration. Check the unit itself before buying.

Look for these three signs:

1. An EID appears in the phone’s status or SIM information.
2. Settings includes Add eSIM or an equivalent option.
3. The phone is unlocked for another provider, and the intended plan supports its country and device variant.

An EID and Add eSIM are strong evidence that the phone can store a profile, but do not guarantee every plan or network will work. Ask Samsung or the seller about the model code if the menu is missing, and confirm unlock status with the original carrier.

This is especially useful when a listing’s 128GB claim does not match Samsung’s published S25 Ultra storage options. Compatibility is determined by the actual handset and its software, not by a marketplace title.

Check EID and eSIM settings before purchase

An EID identifies embedded SIM hardware; it is different from an IMEI and a phone number. Do not share it publicly. Provide it only to a trusted seller or support team if requested.

Look in Settings

Open Settings → Connections → SIM manager and look for Add eSIM. Labels vary by software, market and carrier, so search Settings for “SIM manager” or “eSIM” if needed. You only need to inspect the screen; do not download a profile for this check.

If missing, install system updates, restart and search again. The menu may be absent because of the region, carrier firmware, outdated software or an incorrect model description. Do not infer support from the family name alone.

Find the EID

Check Settings → About phone → Status information or SIM card status for EID. It may also appear in SIM manager. Menu names vary by software.

An IMEI alone does not prove eSIM support. If EID and Add eSIM are missing after an update and restart, ask Samsung or the seller to confirm the model and country variant. Ask the original carrier about unlocking if needed.

Quick compatibility checklist

• [ ] About phone identifies the device as a Galaxy S25 Ultra, with a model code matching the listing.
• [ ] The actual storage information matches the claimed 128GB capacity; any mismatch is resolved.
• [ ] Settings shows an EID and Add eSIM or an equivalent setup option.
• [ ] The phone is unlocked for use with another provider.
• [ ] Software is current and SIM manager is available.
• [ ] The plan covers your destination and dates, and its activation rules suit your itinerary.

Why regional and carrier differences matter

Phones in the same family can differ by model code, firmware, SIM tray or carrier customization. Imported and carrier-branded units may behave differently. Check the EID and Add eSIM option on your own handset.

Samsung’s official S25 Ultra pages reviewed here show 256GB, 512GB and 1TB variants. Since 128GB appears for some other Galaxy S25 models, a marketplace listing may have mixed product information. Compare the phone’s model code and storage with the seller’s description.

The carrier may not support eSIM for a specific model or account, and a lock may block another provider’s profile. Ask the original carrier about unlock status. The number of profiles usable at once can vary; follow SIM manager.

Check your device before you select a travel plan.

How to install an eSIM on Samsung Galaxy S25 Ultra 128GB

Connect to Wi‑Fi, update and charge the phone. Have the plan’s QR code or activation details ready on another screen or printed page. Some plans use manual details or an app. Follow the plan’s instructions because codes may not work again after a profile is deleted.

For Android, see Kaspersky eSIM Store’s Android installation instructions. The separate iOS installation instructions are for someone setting up an eSIM on an iPhone.

Install with a QR code

1. Open Settings → Connections → SIM manager.
2. Tap Add eSIM, then choose the QR scanning option if it appears.
3. Scan the plan’s QR code while the phone is connected to Wi‑Fi.
4. Review the on-screen details and confirm the download or add action.
5. Wait for the profile to install. Restart if prompted.
6. Return to SIM manager and check that the profile appears. Give it a clear label such as “Travel.”

A phone cannot scan its own screen. Show the code on another device, print it or use manual entry if offered. Keep the activation QR private.

Use manual details or an app

For manual setup, copy the supplied activation address and code exactly, checking punctuation and lookalike characters. For app setup, stay online and follow its prompts. Use details supplied for this plan only.

The profile may need to be enabled or may activate only on a supported network. Validity may start at installation, first connection or a specified date; check the plan’s rule before setup.

Activate the profile and choose mobile data

In Settings → Connections → SIM manager, enable the travel profile and choose the line for calls, messages and mobile data. A travel eSIM may be data-only, without a regular number, calls or SMS unless its terms say otherwise. Check home-line roaming charges if you keep it active.

Set the eSIM as the Mobile data line. Turn on Data roaming for that profile if the plan requires it; check the selected line to avoid using home-carrier data unexpectedly.

A practical activation sequence:

1. Install over Wi‑Fi at a time permitted by the plan’s rules.
2. Keep your regular SIM for calls or SMS if needed; select the travel eSIM for data when appropriate.
3. Enable roaming only for the travel profile if the instructions call for it.
4. Turn Wi‑Fi off briefly and load a simple webpage to test mobile data.
5. Check the plan account or app for its activation state, remaining data and validity.

You may be able to keep the profile off until arrival, depending on plan terms. For multi-country trips, check each destination and when the validity period starts.

Using a travel eSIM on a trip

A data eSIM can support maps, messaging, ride bookings, email and translation apps. Download offline maps before departure. If you cross a border and data stops, confirm that country is covered, then follow the plan’s network or APN instructions.

If you need your home number for a bank message, check roaming conditions before keeping that SIM active. You may use the travel eSIM for data and the home line for calls or SMS, subject to device and plan rules. A data-only eSIM is not a phone number; internet calling apps use data.

Consider the trip type when choosing a plan:

• Short city break: Match the plan’s coverage and validity to the days you need data. Install over Wi‑Fi and activate according to its start rule.
• Several countries: Check all destinations along the route. A regional plan may fit, but verify the exact countries and conditions.
• Work or family contact: Decide which SIM handles calls and which handles data. Check home-carrier charges and use Wi‑Fi for large uploads when convenient.

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. Review the destination, allowance, validity and price, then follow setup for a compatible phone. Kaspersky eSIM Store is not a mobile operator or network owner; availability and performance depend on the plan, network partners, local coverage and device. Review plan conditions and device compatibility before arranging the eSIM.

Troubleshooting common problems

There is no Add eSIM option

Search Settings for “eSIM” and “SIM manager,” update and restart. Check the model code and country variant in About phone. If EID and Add eSIM remain absent, ask Samsung or the seller about this handset’s configuration and any carrier restriction.

The QR code will not scan or download

Enlarge and brighten the code on another screen, hold the phone steady, and check it belongs to the plan and is unused. Use stable Wi‑Fi and automatic date and time. If it is expired or marked used, contact plan support. Do not delete a partial profile until support advises you.

The profile appears, but there is no service

Confirm the eSIM is enabled, selected for data and valid in the country. Check its start date and enable roaming if required. Toggle airplane mode, then retry or restart. Follow APN or network instructions and test with Wi‑Fi off.

Data is using the wrong SIM

In SIM manager, select the travel eSIM under Mobile data and turn off home-line data roaming if appropriate. Recheck after restart or profile changes.

The plan is installed but not active

Installation stores the profile; service may require enabling it, reaching the destination or another provider step. Check activation rules and account status, then contact plan support if unclear. Do not expose your QR code or full EID in screenshots.

The phone is locked or the 128GB listing is unclear

A carrier lock can block another provider’s eSIM. Confirm unlock status with the original carrier. Samsung’s official S25 Ultra options reviewed here do not include 128GB, so resolve any listing mismatch before travel.

Frequently asked questions

Does the 128GB version definitely support eSIM?

Samsung lists the Galaxy S25 Ultra family as eSIM-capable, but the official S25 Ultra storage options I checked did not include 128GB. Verify the phone’s model code, EID and Add eSIM setting, and confirm that it is unlocked. Storage capacity alone does not establish eSIM support.

Can I use a physical SIM and eSIM together?

Samsung’s regional S25 Ultra specifications include SIM 1 + eSIM and Dual eSIM. The combinations available on your device depend on its market and software. SIM manager shows which lines can be enabled together.

Will eSIM work on a phone bought abroad?

It may, but country of origin, model code, carrier firmware, local rules and provider support can matter. Confirm EID and Add eSIM on the handset and check the plan’s device requirements for that variant.

Does a travel eSIM give me a phone number?

A mobile-data plan is generally data-only unless calls, SMS or a number are specifically included. Internet messaging or calling apps can use the data connection. Your regular number may remain available if the home SIM is enabled and its roaming conditions are acceptable.

Should I install before flying?

It can be convenient to install over Wi‑Fi before departure, but check when validity starts. The plan may begin at installation, first network connection or a scheduled time.

Can I move the eSIM to another phone?

Do not assume so. Activation codes may be limited to one installation, and transfer depends on the provider and device. Confirm reissue or transfer rules before deleting the profile or changing phones.

Final device check and travel eSIM choice

Before arranging a travel plan for Samsung Galaxy S25 Ultra 128GB, complete these checks:

1. Confirm the model code and claimed 128GB storage on the phone; resolve any mismatch with the seller.
2. Find the EID and confirm that Settings offers Add eSIM.
3. Confirm the phone is unlocked and that the plan accepts its region and carrier variant.
4. Match the plan’s destination, route, data allowance and validity to your trip, including when its validity begins.
5. Install and activate using the plan’s instructions, then select the right SIM for data and test the connection.

After compatibility is confirmed, Kaspersky eSIM Store can help you choose, arrange and activate an eSIM plan for mobile data during an overseas trip. Check its stated coverage, data and validity conditions, and keep the device checks above in mind if setup needs troubleshooting. The exact handset remains the deciding factor, especially when its listed storage variant is uncertain.