Purchased a SIM-free model of AI smartphone Galaxy S24 and changed from au line to docomo line using IIJmio using voice eSIM [Actual device review]

update Last updated: June 6, 2024 at 3:30 PM

From Samsung Electronics Japan Co., Ltd., the flagship smartphones "Galaxy S24" and "Galaxy S24 Ultra" equipped with Galaxy AI will be available for pre-order from Wednesday, April 3, 2024, and will be available on Thursday, April 11, 2024. Following the announcement that it would be released, I pre-purchased the SIM-free model of the Galaxy S24, which I had been planning to purchase, on the Samsung shop site.

The Galaxy S24 Ultra is very attractive due to its high-performance camera functions, but the price is too high and the body is heavy so I felt it was a little inconvenient to carry around on a daily basis, so I chose the Galaxy S24 because of its portability. selected.

The device I mainly used was a Galaxy S10+, and a cheap SIM IIJmio I had been using an au line with a voice SIM inserted, but when I received the SIM-free Galaxy S24, I switched to a docomo line.
The reason why I changed the main device to a docomo line is that the iPhone SE2 I am using as a sub device is a povo 2.0 au line, so I decided to use two types of lines together for fail-safe purposes.

The Galaxy S24 has a built-in eSIM, so if you go to your carrier or MVNO's website to change the line using the eSIM, the line will be switched in real time and you will be able to use mobile communication immediately, which is very convenient. is.
Therefore, when I received the Galaxy S24 that I pre-ordered from Samsung, I immediately went through the procedures to issue an eSIM to my docomo line.

Order your Galaxy S24

As posted, I ordered the Galaxy S24 (SIM-free, 256GB, cobalt violet) on April 5th (Friday) for a purchase price of 124,700 yen.
Initially, the reservation site stated that the item would be delivered in mid-May, but in my case, the item arrived on Wednesday, April 17th.
There have been many reports of shipping delays due to a rush of orders, but the SIM-free version may have had a little more inventory than the carrier version.

For this order, I had my Galaxy S9+ taken away from me in conjunction with the "Samsung Trade-in Service Limited Time Increase Campaign," but after the estimate from Samsung, I was told that the screen was too cracked, so I had to return it. It's gone. If the screen hadn't been broken, I could have had it taken away for 8,000 yen...
On the Samsung trade-in service website, it was written that it was okay even if the screen was cracked, so it was a different story 😥

Furthermore, if the screen is not cracked, I think you will probably be able to sell it for a higher price if you sell it on Yahoo! Auctions or Mercari. Also, if you apply for the Samsung trade-in service, your device will be taken away immediately within 3 days, so please be careful as this may hinder the migration process.

2024.06.06 Added
I received a 10,000 yen off coupon in conjunction with the "Galaxy S24 | S24 Ultra release commemorative campaign", so I received a free "25W Wireless Battery Pack 10,000mAh (EB-U2510)" that can be charged wirelessly at the Galaxy Store. I bought it at

Galaxy S24 features and specifications

The image editing and translation functions using Galaxy S24's Galaxy AI are truly amazing and innovative, and I think they are one step ahead of their competitors at this point.

The features and specifications of Galaxy S24 are summarized below.

Features of Galaxy S24

The global Galaxy S24 series will be released on Wednesday, January 31, 2024, and the domestic version will be available for pre-order on Wednesday, April 3, 2024, and will be released on Thursday, April 11, 2024. Ta
"Galaxy S24" is a flagship smartphone announced globally by Samsung, and has the following features.

[Processor and memory]

  • The chipset is equipped with Qualcomm's "Snapdragon® 8 Gen 3 for Galaxy", which provides the highest performance in Galaxy history, allowing you to enjoy the gaming play you desire.
  • Memory is 8GB, and storage options are 128GB, 256GB, and 512GB.


  • Equipped with an approximately 6.2-inch full HD+ organic EL display (2340 x 1080, 2600 nits).
    The display bezels have been slimmed down and evened out to provide more viewing area.

[Camera performance]
The following cameras are installed on the back.

  • Approximately 50 million pixels wide-angle camera (F1.8)
  • Approximately 12 million pixels ultra-wide-angle camera (F2.2)
  • Approximately 10 million pixel telephoto camera (F2.4, maximum 3x optical zoom)
  • The front is equipped with a front camera (F2.2) with approximately 12 million pixels.

 Camera details

  • You can zoom 2x or 3x by simply pinching the screen with your fingers and spreading it out.*10,11
  • With Space Zoom (first introduced in the Galaxy S20 Ultra released in 2020), you can take bright, colorful, and clear photos that look like daytime, even in the dark.*12
  • With up to 30x AI zoom, it faithfully reproduces vivid, clear, sharp, and high-quality photos down to the last detail.*13,14

*10 Optical equivalent zoom is possible with the adaptive pixel sensor.
*11 2x zoom must be enabled in the settings of the "Camera Assistant" app. Camera Assistant can be installed from the Galaxy Store.
*12 Results may vary depending on the lighting environment and shooting conditions (multiple objects, out of focus, moving objects, etc.).
*13 30x Space Zoom includes 3x optical zoom and 30x digital zoom with super resolution technology. Exceeding 3x zoom may cause image degradation.
*14 AI zoom is applied to the digital zoom range. We do not guarantee the accuracy of the finish.

【AI function】

  • Galaxy AI enables real-time interpretation, text translation, chat assist, image search, advanced image editing, and more.

Search... The new feature of "Kokotte Search" opens up a new era of search methods. You can instantly search anything on the screen with just a circular gesture without having to type anything in the search bar. You can search intuitively and seamlessly without having to switch between apps. "Kokotte Search" is for still images, videos, and web browsers.
It is useful in various situations such as the SNS.

Translation... Galaxy AI's interpretation and translation function allows real-time interpretation of call content and translation of message content. It supports 13 languages ​​around the world, including Japanese, English, Korean, Spanish, and Chinese, allowing you to communicate with people all over the world.

Translation/Summary...AI sorts handwritten notes with one tap, converts them into text, and translates and summarizes them. Scribbled notes taken in a hurry with the S Pen (Galaxy Ultra) can be completed in no time, just like the notebooks of someone who can do it. Additionally, you can not only convert the meeting content recorded with a voice recorder into text, but also translate and summarize it. You can also organize the minutes in a smart manner.

Generative AI Editing...Generative AI Editing regenerates images according to resizing, deletion, or repositioning of objects within the image. Users can also enlarge the image and let the AI ​​create the perfect background and complete the cropped items in the image. The output content will have a watermark indicating that it was edited with Generated AI Editing.

Chat Assist...Galaxy AI Chat Assist is an AI support function installed in Samsung's Galaxy S24 series that allows users to adjust writing style and check spelling and grammar when entering messages on SNS etc. I can. We also provide real-time translation support, making multilingual communication easier. This feature is very useful in daily life and business communication.

[Body and waterproof performance]

  • It has an armored aluminum frame that is both lightweight and durable.
  • It has waterproof/dustproof performance that complies with IP68 standards.

[Achieving high safety with advanced security and privacy]

  • The "Galaxy S24 series" is protected by Samsung's proprietary security platform "Samsung Knox", which protects important information and strengthens security against vulnerabilities through real-time threat detection and more. With unrivaled protection, you can always have peace of mind with a Samsung smartphone.

[OS and security updates]

  • The Galaxy S24 series will receive OS and security updates for up to 7 years after launch.

[Bluetooth audio codec]

  • Galaxy S24 supports major Bluetooth audio codecs, including SBC, AAC, LDAC, and Samsung's proprietary SSC (Samsung Seamless Codec). However, support for AptX and AptX Adaptive has been removed.
  • Samsung has focused on its own audio solutions, especially the LDAC codec, which allows for higher quality streaming with Bluetooth audio.

In general usage scenarios, SBC and AAC are often used, but if you want to enjoy high-quality music and audio, we recommend choosing LDAC (assuming the connected audio supports high-resolution). From the Galaxy S24 settings screen, you can open the Bluetooth audio settings and select your desired codec. Please try finding the settings that best suit your tastes and environment.


  • Compatible with 5G, Wi-Fi 6E, Bluetooth 5.3, and eSIM.
  • The display's color gamut is 100% DCI-P3 compatible, allowing you to display accurate and richly gradated graphics.
  • "Galaxy S24" combines the latest technology and AI features to provide a superior mobile experience.

Galaxy S24 specs

Below are the color variations and specs of Galaxy S24. The names and functions of each part are ☞Here

【Color variations】

cobalt violet
amber yellow
onyx black

Galaxy S24 (256GB) specs

Snapdragon® 8 Gen 3 Mobile Platform for Galaxy

clock frequency
3.39GHz, 3.1GHz, 2.9GHz, 2.2GHz
Number of CPU cores
Octa core
Main display size
156.4mm (6.2 inches)

Main display type
Dynamic AMOLED 2X (organic EL)

Main display resolution
2340 x 1080 (FHD+)

Main display refresh rate
120 Hz
cameraOut (main) camera – number of pixels (multiple)
50.0 MP (wide angle & 2x optical equivalent zoom) + 10.0 MP (3x optical zoom) + 12.0 MP (ultra wide angle)

Out (main) camera – autofocusvinegar

Out (main) camera – zoom
3x optical zoom, 2x optical equivalent zoom (enabled with adaptive pixel sensor), digital zoom (up to 30x)

Out (main) camera – flash

Slow motion
240fps @FHD, 120fps @UHD
Out (main) camera – F value (multiple)
F1.8, F2.4, F2.2

Out (main) camera – OIS

In (sub) camera – F value

In (sub) camera – number of pixels
12.0 MP

In (sub) camera – autofocus

video shooting resolution
@UHD 8K (7680 x 4320)
storage/memoryMemory (GB)

Available storage (GB)
Storage (GB)
way of communicationNumber of SIM cards
dual sim

SIM slot type
SIM 1 + eSIM / Dual eSIM

GSM850, GSM900, DCS1800, PCS1900

B1(2100), B2(1900), B3(1800), B4(AWS), B5(850), B7(2600), B8(900), B12(700), B13(700), B18(800), B19(800), B20(800), B21(1500), B26(850), B28(700), B66(AWS-3)

5G FDD Sub6
N1(2100), N3(1800), N5(850), N28(700), N66(AWS-3)
Compatible SIM
Nano-SIM (4FF), built-in SIM

Compatible network

B1(2100), B5(850)

B38(2600), B39(1900), B40(2300), B41(2500), B42(3400)

5G TDD Sub6
N41(2500), N77(3700), N78(3500), N79(4500)
Communication/connection terminalUSB interface
USB Type-C

location intelligence
GPS, Glonass, Beidou, Galileo, QZSS


Wi-Fi Direct

USB version
USB 3.2 Gen 1

earphone jack
USB Type-C

802.11a/b/g/n/ac/ax 2.4GHz+5GHz+6GHz, HE160, MIMO, 1024-QAM

Bluetooth version
Bluetooth v5.3

Connection with PC
Smart Switch(PC版)
OSAndroid 14
sensorAcceleration sensor, atmospheric pressure sensor, fingerprint sensor, gyro sensor, geomagnetic sensor, hall sensor, illuminance sensor, proximity sensor
size and weightSize (height x width x thickness, mm)
147.0 x 70.6 x 7.6
Weight (approx. g)
BatteryInternet usage time (LTE) (hours)
Max 25

Video playback time (hours, wireless connection)
Max 28

music play time (time, wireless connection)
Max 72
Internet usage time (Wi-Fi) (hours)
Max 25

Battery capacity (mAh, standard)
Qi compatible

(Wireless charging compliant with Fast Wireless Charging 2.0)

wireless power share
USB-C rapid up to 25WChargeCompatible with
(Battery can be charged to 50% in 30 minutes)
audio/videoStereo compatible

video playback resolution
UHD 8K (7680 x 4320) @60fps

bluetooth audio codec
video playback format

audio playback format
Service/ApplicationGear compatible
Galaxy Buds2 Pro, Galaxy Buds Pro, Galaxy Buds Live, Galaxy Buds+, Galaxy Buds2, Galaxy Buds, Galaxy Buds FE, Galaxy Fit2, Galaxy Fit e, Galaxy Fit, Galaxy Watch6, Galaxy Watch5, Galaxy Watch4, Galaxy Watch3, Galaxy Watch, Galaxy Watch Active2, Galaxy Watch Active

Bluetooth® hearing aid support
Android Audio Streaming for Hearing Aid(ASHA)
Compatible with Samsung DeX

SmartThings compatible

One Seg/Full Seg

Galaxy S24 Change to IIJmio's docomo line with eSIM

The model I'm currently using is the Galaxy S10+, which has a contract with IIJmio's au line, which is a cheap SIM.
This time, with IIJmio's campaign, the carrier change fee for voice eSIM is waived, so I changed my docomo line to voice eSIM.

In addition, prior to switching the eSIM, we performed the initial settings of the Galaxy S24 and migrated data from the old device Galaxy S10+ using Wi-Fi.
Just by scanning the QR code from the destination smartphone to the source smartphone, the Smart Switch app will connect to Wi-Fi and automatically transfer data, making the migration process really easy.
Thanks to the Galaxy S24's high CPU performance and the Wi-Fi 6 standard router's high-speed data transfer (128GB data capacity), the migration process was completed in less than 45 minutes.

Apply to exchange your docomo line for a voice eSIM on the IIJmio website

IIJmio, a low-cost SIM, is running a "Voice Only! SIM Exchange Fee Discount Campaign" for a limited time from January 18, 2024 to June 3, 2024. If you are currently using the IIJmio Mobile Service Giga Plan and change to a "voice eSIM" through the SIM exchange procedure during the period, the fee will be 0 yen.
For more information, click here ☞ Audio only! SIM exchange fee discount campaign | IIJmio

The gallery below shows the procedure for changing from an au line (type A) voice SIM to a docomo line (type D) eSIM.
eSIMの発行手続きで必要となるEID(32桁のeSIM識別番号)は、Galaxy S24の箱の側面に印字されていますが、スマホからの操作で「設定」>「端末情報」>「ステータス情報」でも参照可能です。

Voice eSIM activation procedure for Galaxy S24

If you issue an eSIM, it will be activated automatically, so no activation procedures are required.
When changing from a voice call SIM (type A) to a voice eSIM (type D), it is said to take about 1 hour as shown in the table below, but in reality it took about 15 minutes. !

The gallery below is the notification screen of the Galaxy S24 when it is automatically activated after applying for eSIM issuance on IIJmio's website. Just follow the guide and your eSIM will be added automatically.

In addition, in the case of IIJmio, after activating the eSIM, it seems that mobile communication cannot be performed properly unless APN settings for IIJmio are also performed. For more information on eSIM initial setup and APN settings, please refer to the link below.

[APN setting information]
Name: iijmio
 APN: iijmio.jp
 Username: mio@iij
 Password: iij
Authentication type: PAP or CHAP

About the use of Plus Message (+Message)

Previously, MVNO subscribers could not use the SMS app "+Message", which allows you to confirm that the carrier-provided version of SMS has been read when sending and receiving SMS. is available from ).
Therefore, if you have IIJmio's D Plan (docomo line), you can use Plus Message by downloading and installing the docomo version of ``+Message'' from the Google Play Store.

I tried using the AI ​​function of Galaxy S24

I actually tried using various AI functions and translation functions provided by Galaxy S24. The details of its functions are summarized below.

Summary function

Let's use Galaxy AI's summary function to display a summary of this article. The steps are as follows:

  1. Open the Samsung Browser app, navigate to any web page, and select the "Browsing Assist" icon.
  2. "summary"Choose. ⇒ You can switch between standard and advanced mode in the summary dialog
  3. text in bullet pointssummarywill be done.summaryYou can also translate web pages.

[Summary]… Standard mode

Purchased Galaxy S24 and changed from au line to docomo line with IIJmio

• From Samsung Electronics Japan Co., Ltd., the flagship smartphones “Galaxy S24” and “Galaxy S24 Ultra” equipped with Galaxy AI will be available for pre-order from Wednesday, April 3, 2024, and will be available for pre-order from Thursday, April 11, 2024. I pre-purchased the SIM-free model of the Galaxy S24, which I had been planning to purchase, on the Samsung shop site following the announcement that it would be released in 2019.

• Galaxy S24 has a built-in eSIM, so if you go to the carrier or MVNO website to change the line using eSIM, the line will be switched in real time and you will be able to use mobile communication immediately. Convenient.

• There have been many reports of shipping delays due to a rush of orders, but the SIM-free version may have more inventory than the carrier version.

• Galaxy S24 is Samsung's globally announced flagship smartphone with the following features:

• The Galaxy S24 series is protected by Samsung's proprietary security platform, Samsung Knox, which uses real-time threat detection and more to protect critical information and strengthen security against vulnerabilities.

Photo editing suggestions

When you tap the "i button" in the Galaxy's gallery app, detailed information about the selected photo or video will be displayed, and for photos, "photo editing suggestions" by Galaxy AI will also be displayed at the same time.

The gallery below is a gallery photo taken with an older model (Galaxy S10+) that has been improved in quality using the "correction" function suggested by Galaxy AI's "Photo editing suggestions".

The gallery below is a gallery photo taken with the Galaxy S24 that was automatically corrected and saved using the "Erase reflections" function suggested by Galaxy AI's "Photo editing suggestions."

-Editing suggestions are compatible with JPG, PNG, GIF, and MP4 formats. Final results and quality may vary depending on the condition of the original image. The accuracy of the final results is not guaranteed.
-Screen and UI images are simulations for explanation purposes. UX/UI may vary depending on OS/One UI version, device model, region, and other factors.
・Editing suggestions may vary depending on the content of the photo.
・Some functions (Long Exposure / 24 Hour Time Lapse / Highlights) will be displayed after a certain period of time after shooting and while the smartphone is charging.
-Due to the nature of AI, results and quality may vary each time.

Generate AI compilation

By tapping the "Edit button" in the Galaxy's gallery app, switching to editing mode, and then tapping the Generated AI editing icon, you can edit the selected photo with Generated AI.

The following is an example of how to move objects within an image using the AI ​​editing function that generates a gallery photo. Images are regenerated as objects are resized, deleted, or repositioned. The output content will have a watermark indicating that it was edited with Generated AI Editing.

Search in parentheses

Kakotte Search is a Google-enabled feature that lets you quickly search for information about what's on your screen, including images, videos, and text, using simple gestures with your finger or S Pen. .

The steps to enable "Kokotte Search" are as follows, but it is enabled by default.

  1. Open Settings and tap Display.
  2. Select navigation bar.
  3. Turn on search by parentheses.

Please note that an Internet connection is required to use this feature. Also, due to the nature of search algorithms, searches for the same image may yield different results.

``Kokotte Search'' allows you to search the Internet by simply circling an object of interest in an image displayed on your smartphone screen. Long press the Home key and use your finger or S Pen to circle or tap the object you want to automatically start searching the internet.

The following is an example of how to search for photos in the gallery using "Search by parenthesis".

How to set up and use the interpreter app

Galaxy AI also offers an interpreter app. Interpretation apps translate face-to-face conversations in real time and can be used in a variety of business and personal situations. Below is a brief explanation of how to use it.

Open the quick panel and select "Interpreter".
Select your preferred language by tapping Language next to the microphone icon at the bottom of the screen. Select the language the other person uses by tapping Language next to the microphone icon at the top of the screen.
Tap the change display mode icon in the top right corner and turn the top half of the screen toward the other person. Tap the microphone icon facing you and start speaking.
The app translates what you say audibly and displays a transcription in the user's original language and a written translation in the other person's language. It can also be used for face-to-face conversations and real-time interpretation over phone calls. This feature makes it easier to communicate with people who speak multiple languages, and is useful in a variety of business and personal situations.

The gallery below shows the settings of the interpreter app and examples of its use.

*At the time of release, 13 languages ​​(17 regions) are supported, but more languages ​​will be added in future updates.

  • Supported languages ​​(regions)
    Simplified Chinese, English (India, UK, US), French, German, Hindi, Italian, Japanese, Korean, Polish, Portuguese (Brazil), Spanish (Mexico, Spain, US), Thai Vietnamese
  • Note:
  • If the tap to voice input feature is enabled, both speakers must tap their respective microphone icons each time they speak.
  • If the tap to voice input function is [Disabled], if the first speaker finishes speaking after tapping the microphone icon, the other party's microphone will be automatically enabled after that person finishes speaking.

Text calls and real-time interpretation

Two functions are available during a call: "Text Call" and "Real-time Translation".

the formertext callis a feature that transcribes calls and communicates with synthesized voices, and the audio is converted to text and processed on-device.
This feature is useful, for example, when you don't want to answer an incoming call from an unknown number, or in situations where it's difficult to make a call, such as on a train.
If you enable this function, your voice will not be heard by the other party, but it will be played as a synthesized voice (male and female voices can be selected) to the other party. The other party's utterances are automatically converted to text and can be viewed in chat format.
However, since the voice is immediately recognizable as a synthesized voice and the response feels strange to the other party, it seems that this function is limited to applications such as communication with unknown callers.

For the phone appreal-time translationIt also has the following functions: When you turn on this function, what you say in Japanese will be converted into foreign languages ​​such as English, Korean, and Chinese.
For example, when you call a hotel at an overseas destination to confirm your reservation, you can communicate smoothly even if the other party speaks in English and you speak in Japanese. What you say is converted into text one by one and instantly translated and communicated to the other person.
A series of processes such as speech recognition, translation, and speech synthesis are performed on-device, and everything from utterance to playback of translated audio is processed in real time. It seems that you can have a practical conversation with someone who speaks slowly, like a hotel receptionist, but since the exchange is done using an artificial voice, just like a text call, I think there is a high possibility that the other person will think you are suspicious. I will.
Therefore, this function is just a support tool to help you communicate in a language you don't speak while traveling.

Note that the initial settings for "Live Translation" are "Setting"in,"useful function」>「advanced intelligence」>「Telephone" and then "live translation” (on by default).
Before you start using Live Translate, you can choose your language, the language of the person you're speaking to, and the type of translated audio.

Below is a test example of using real-time interpretation in a phone app.

  • Supported languages ​​(regions)
    Simplified Chinese, English (India, UK, US), French, German, Hindi, Italian, Japanese, Korean, Polish, Portuguese (Brazil), Spanish (Mexico, Spain, US), Thai Vietnamese
  • Note: Other features include:
  • mute audio: You can block the other party's voice or your own voice during a call so that you only hear the translation.
  • Language and voice presets for each user: You can set the language and voice for calls to specific phone numbers or contacts.

chat assist

Galaxy AI's chat assist is available for all SNS apps such as LINE, Facebook, Instagram, X, TikTok, Messenger, Mixi, +Message, etc.
Tap the Galaxy AI icon in your keyboard's menu bar and select Chat Translation, Writing Style, and Spelling and Grammar options from the pop-up menu. Depending on the options you select, Galaxy AI will instantly perform the task live on your device.

The gallery below is an example of using Chat Assist's "Sentence Style" in the Line app.

The gallery below is an example of using Chat Assist's "Chat Translation" in the Line app.

Translation function compatible with third-party apps

By using the Samsung keyboard, you can also translate the text you type.
The following is an example of usage in the LINE app.

Translation in Gmail

The gallery below shows examples of how to use Translate in Gmail.

Take photos with 30x digital zoom with Galaxy S24 out camera

The Galaxy S24's out-camera is equipped with a 30x digital zoom function using super resolution technology.
I tried shooting the night sky with the out-camera setting "Intelligent Optimization" set to "Highest" for image quality optimization and "ON" for scene-specific optimization.
The gallery below is a photo of the moon zoomed in 30x. I was impressed that I was able to clearly capture the craters on the moon!

The gallery below is a photograph of a daytime landscape (inside the red frame) zoomed in 30 times. It was installed offshore 1 km from the Shonan coast (Hiratsuka/Nijigahama). University of Tokyo Hiratsukaoki Comprehensive Experiment Tower was able to be photographed.
However, at 30x, the image quality seems to be poorer. As expected, it is inferior to the Galaxy S24 Ultra, which supports digital zoom up to 100x.

Shooting with Galaxy S24 front camera

The gallery below is a selfie taken in a bright place (home) and a dark place (store).
The F value of the front camera of the Galaxy S10+ that I used before is 1.9, while the F value of the Galaxy S24 front camera is 2.2, so in dark places the Galaxy S10+ front camera seems to take brighter pictures. In fact, even if you take pictures in a dark place with the flash on the Galaxy S24's front camera turned off, the pictures will be quite bright. This may be due to improved sensor performance and AI image processing capabilities.

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