#36

Samsung Electronics

Samsung Electronics Samsung Galaxy S21 Ultra 5G SM-G998UZKAXAA

Name: Samsung Galaxy S21 Ultra 5G SM-G998UZKAXAA
Brand: Samsung Electronics
SKU: B08VL1Q7Z1
Price: 24999 JPY
Availability: InStock
Rating: 4.1875 (1 reviews)

Rating

Model: SM-G998UZKAXAA

$24,999(incl. tax)Amazon price as of 2025-09-03

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Product Overview

The Samsung Galaxy S21 Ultra 5G is a renewed, factory-unlocked Android smartphone featuring a pro-grade camera with a 108MP high-resolution sensor. It boasts 128GB of internal storage and is compatible with US version 5G networks. The device has been professionally inspected and tested to work and look like new, ensuring a high-quality experience. It offers flagship features at a more accessible price point, making it a great option for value-conscious buyers.

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Product Specifications

Display Size

6.8inches

Display Resolution

3200 x 1440pixels

RAM

128GB

Storage Capacity

128GB

Main Camera Resolution

108MP

Front Camera Resolution

-MP

Battery Capacity

-mAh

Operating System

Android

Processor

Snapdragon

5G Support

Yes

NFC Support

-

Water Resistance

-

Wi-Fi Standard

-

Size & Weight

Weight

13.1 ounces

Hight

10 inches

Width

7 inches

Depth

3 inches

Features

Wireless Charging Function

Feature Description

A function that allows charging the smartphone simply by placing it on a compatible charging pad, without needing to plug in a cable. Useful for quickly charging at home or in the office, preventing cable clutter. Allows easy charging whenever the battery is low.

About This Product

Wireless charging is not explicitly mentioned, so it's assumed this function is not available. This may be a drawback for users who prefer the convenience of wireless charging, requiring them to use traditional cable charging methods.

Water Resistance Function

Feature Description

A function that protects the smartphone from water damage. Offers peace of mind when using the phone in the rain, around water, or during outdoor activities. Helps prevent malfunction from accidental splashes.

About This Product

Water resistance is not explicitly mentioned, so it's assumed this function is not available. Users should exercise caution when using the phone around water or in wet conditions to prevent potential damage, as there's no protection against splashes or submersion.

Expandable Storage Function

Feature Description

A function that allows increasing storage capacity using a microSD card. Useful for storing large amounts of photos, videos, and apps without worrying about running out of space. Provides flexibility for managing data storage needs.

About This Product

Expandable storage via microSD card is not explicitly mentioned, so it's assumed this function is not available. Users are limited to the internal storage of 128GB, requiring them to manage their files and media effectively or utilize cloud storage options.

Dual SIM Function

Feature Description

A function that allows using two SIM cards simultaneously. Convenient for separating personal and work phone numbers or for using different carriers for domestic and international calls. Simplifies managing multiple phone lines.

About This Product

Dual SIM functionality is not explicitly mentioned, so it's assumed this function is not available. Users are limited to using a single SIM card, which may be a drawback for those who need to manage two phone numbers simultaneously for personal and work use.

Reverse Wireless Charging Function

Feature Description

A function that allows using the smartphone to wirelessly charge other compatible devices, such as wireless earbuds or smartwatches, by placing them on the phone's back. Useful for sharing battery power with other devices when an outlet is not available. Provides emergency charging capabilities.

About This Product

Reverse wireless charging is not explicitly mentioned, so it's assumed this function is not available. The phone cannot be used to wirelessly charge other devices, limiting its utility as a power source for accessories like wireless earbuds or smartwatches.

High Refresh Rate Display Function

Feature Description

A function that displays the screen with a higher refresh rate, resulting in smoother scrolling, animations, and gaming experiences. Reduces eye strain and provides a more responsive feel. Enhances the overall visual experience.

About This Product

The high refresh rate display function is included, resulting in smoother scrolling, animations, and gaming experiences. Reduces eye strain and provides a more responsive feel. Enhances the overall visual experience.

SHOPSTAFF Rating Score

#36

Ranked #36 out of 99 products in Category

4.2

Overall Rating

The renewed Samsung Galaxy S21 Ultra 5G offers flagship features at a mid-range price. Performance is strong for most tasks, but battery life and camera may show their age. Durability is a concern due to it being a renewed device. It's suitable for users seeking premium features on a budget.

Processor Performance

4.0

Rating Criteria Explanation

The processor (CPU) is the brain of the smartphone. A more powerful processor ensures smoother multitasking, faster app loading times, and better performance in demanding applications like gaming and video editing. Consider the processor's core count (e.g., quad-core, octa-core) and clock speed (GHz). Also, look at benchmark scores (e.g., Geekbench, AnTuTu) for a more objective comparison. A faster processor contributes significantly to the overall responsiveness and longevity of the phone, preventing it from feeling sluggish over time.

Rating Comments

The Snapdragon processor provides smooth performance for most tasks, including multitasking and gaming. While not the latest generation, it still offers a responsive experience for everyday use. Expect some limitations with the most demanding applications.

RAM (Random Access Memory)

4.5

Rating Criteria Explanation

RAM is crucial for multitasking. More RAM allows you to run more apps simultaneously without experiencing slowdowns. Insufficient RAM can lead to apps closing unexpectedly or the phone becoming unresponsive. For modern smartphones, 4GB of RAM is generally considered the minimum, with 6GB or 8GB being preferable for heavier users or those who plan to keep their phone for several years. Insufficient RAM will noticeably impact daily use.

Rating Comments

With 128GB of RAM, the phone handles multitasking with ease, allowing you to run numerous apps simultaneously without significant slowdowns. This is ample memory for typical usage scenarios, ensuring a smooth and efficient user experience.

Storage Capacity

4.5

Rating Criteria Explanation

Storage capacity determines how much data (photos, videos, apps, files) you can store on your phone. Consider your usage habits. If you take many photos and videos or download a lot of apps, you'll need more storage. Check if the phone has a microSD card slot for expandable storage. If not, choose a model with sufficient built-in storage from the start. Running out of storage can be a major inconvenience, forcing you to constantly delete files.

Rating Comments

The 128GB of internal storage provides ample space for apps, photos, videos, and files. Most users will find this sufficient for their needs, reducing the need to constantly manage storage. Cloud storage can supplement this if needed.

Camera Quality

4.0

Rating Criteria Explanation

Evaluate the camera based on your photography needs. Consider factors like megapixel count, aperture (lower f-number means better low-light performance), sensor size, and image stabilization (OIS or EIS). Read reviews and compare sample photos taken with different phones to assess image quality in various lighting conditions. Features like Night Mode, Portrait Mode, and video recording capabilities (e.g., 4K resolution, frame rates) are also important considerations. The camera is often a primary factor for many users.

Rating Comments

The 108MP pro-grade camera delivers excellent image quality, capturing detailed photos and videos in various lighting conditions. While it may not match the performance of the newest flagships, it still offers impressive capabilities for photography enthusiasts.

Display Quality

4.5

Rating Criteria Explanation

The display is your primary interface with the phone. Look for a display with good resolution (Full HD or higher for crisp images), brightness (for visibility in sunlight), and color accuracy. Consider the display technology (e.g., AMOLED, LCD). AMOLED displays typically offer better contrast and more vibrant colors, while LCD displays can be more color-accurate. Also, consider the screen size and aspect ratio to ensure it fits comfortably in your hand and is suitable for your intended use (e.g., watching videos, browsing the web).

Rating Comments

The 6.8-inch display with a 3200 x 1440 resolution offers crisp and vibrant visuals, making it enjoyable to view content and navigate the interface. The high refresh rate of 120Hz enhances the smoothness of scrolling and animations.

Battery Life

3.0

Rating Criteria Explanation

Battery life is critical for all-day usage. Look for phones with larger battery capacities (mAh). However, battery capacity alone isn't the only factor. Processor efficiency and software optimization also play a significant role. Read reviews to get a sense of real-world battery performance. Also, consider charging speed and whether the phone supports fast charging or wireless charging. A phone with poor battery life can be extremely frustrating, especially when you're on the go.

Rating Comments

Battery performance is adequate for a full day of moderate use, but heavy users may need to charge it before the day ends. As a renewed device, the battery's health may be degraded, impacting its overall lifespan and requiring more frequent charging.

Manufacturer Reliability and Warranty

5.0

Rating Criteria Explanation

Choose a reputable manufacturer with a history of producing reliable smartphones. Research the manufacturer's warranty policy and customer support reputation. A good warranty can protect you from defects and malfunctions. Reliable manufacturers are more likely to provide timely software updates and security patches, ensuring your phone remains secure and performs optimally over time. A solid warranty and good customer support are essential for peace of mind.

Rating Comments

Samsung is a reputable manufacturer with a history of producing reliable smartphones. However, as a renewed device, the warranty may be limited compared to new devices, and the risk of potential issues is slightly higher.

Cost Performance

4.0

Rating Criteria Explanation

Ultimately, the best smartphone is one that offers the best value for your money. Consider all the features and specifications mentioned above in relation to the price. Don't necessarily assume that the most expensive phone is always the best choice. Look for a phone that meets your needs and budget without compromising on essential features. Compare prices from different retailers and be aware of any promotions or discounts that may be available. Balancing features with price ensures you get the most for your investment.

Rating Comments

At this price point, the renewed Samsung Galaxy S21 Ultra 5G offers excellent value for money, providing flagship features at a mid-range price. It's a great option for users seeking premium capabilities without breaking the bank, balancing cost and performance effectively.

Brand & Manufacturer Details

Samsung Electronics

SAMSUNG

Frequently Asked Questions (FAQ)

Q.I'm considering buying a renewed phone, but I'm worried about the quality. What can you tell me about the condition of this renewed Samsung Galaxy S21 Ultra?

A.This renewed Samsung Galaxy S21 Ultra has been professionally inspected and tested to work and look like new. It may have been returned or traded in, and then inspected by Amazon-qualified suppliers. Staff confirmation indicates that many customers received phones in mint condition, almost like new. However, some staff confirmation mentions potential issues like overheating, screen replacements with LCD instead of OLED, and battery concerns. Be sure to check the return policy.

Q.I'm considering buying a renewed phone, but I'm worried about the quality. What can you tell me about the condition of this renewed Samsung Galaxy S21 Ultra?

A.This renewed Samsung Galaxy S21 Ultra has been professionally inspected and tested to work and look like new. It may have been returned or traded in, and then inspected by Amazon-qualified suppliers. Staff confirmation indicates that many customers received phones in mint condition, almost like new. However, some staff confirmation mentions potential issues like overheating, screen replacements with LCD instead of OLED, and battery concerns. Be sure to check the return policy.

Q.I saw a staff confirmation mentioning the phone gets hot. Is this a common issue with the renewed S21 Ultra, and should I be concerned?

A.Yes, one staff confirmation specifically mentions the phone overheating, even with minimal use. While another staff confirmation notes that some warming is natural during data transfer or charging, excessive overheating could be a concern. If you are not super tech-savvy, a lot of this might fly under the radar until it's too late. So if you’re still planning to buy from this seller, I suggest you budget for a genuine OLED screen, fresh seals, and a battery swap.

Q.I saw a staff confirmation mentioning the phone gets hot. Is this a common issue with the renewed S21 Ultra, and should I be concerned?

A.Yes, one staff confirmation specifically mentions the phone overheating, even with minimal use. While another staff confirmation notes that some warming is natural during data transfer or charging, excessive overheating could be a concern. If you are not super tech-savvy, a lot of this might fly under the radar until it's too late. So if you’re still planning to buy from this seller, I suggest you budget for a genuine OLED screen, fresh seals, and a battery swap.

Q.Some staff confirmation mentioned screen issues, like dead pixels and a non-original LCD. Is the screen quality reliable on this renewed phone?

A.Screen quality appears to be a potential issue. One staff confirmation reported dead pixels forming within a week and the screen being a cheap LCD replacement instead of the original OLED. They also mention brightness degrading quickly and black spots appearing. If screen quality is important to you, factor in the possibility of needing a screen replacement.

Q.Some staff confirmation mentioned screen issues, like dead pixels and a non-original LCD. Is the screen quality reliable on this renewed phone?

A.Screen quality appears to be a potential issue. One staff confirmation reported dead pixels forming within a week and the screen being a cheap LCD replacement instead of the original OLED. They also mention brightness degrading quickly and black spots appearing. If screen quality is important to you, factor in the possibility of needing a screen replacement.

Q.I'm seeing mixed information about the battery. Is it likely I'll need to replace the battery on this renewed phone?

A.A battery replacement may be recommended. One staff confirmation suggests the battery feels worn or aftermarket. Battery life can vary on renewed devices, so consider this when making your decision. One staff confirmation indicated good battery usage after continuous use, but your experience may vary. Also be aware that when transferring from old phone to the new one or charging the batteries the phone will get warm..this is natural.

Q.I'm seeing mixed information about the battery. Is it likely I'll need to replace the battery on this renewed phone?

A.A battery replacement may be recommended. One staff confirmation suggests the battery feels worn or aftermarket. Battery life can vary on renewed devices, so consider this when making your decision. One staff confirmation indicated good battery usage after continuous use, but your experience may vary. Also be aware that when transferring from old phone to the new one or charging the batteries the phone will get warm..this is natural.

Q.One staff confirmation mentioned the phone body crumbling after a few months. Is this a common problem with this renewed model?

A.This is not likely a common problem, as most staff confirmation didn't mention the phone body crumbling. This phone was bought in August. Its May. So 9 months for $300. Since yesterday network failures off and on for days, now not on again. Four trips to Verizon with even an Esim card installed, network reset, updates are current, nothing. Blutooth no longer connects. When this does work the network cuts off in my own home and office. Also noteworthy, once the short term warranty expired the phone body began crumbling. I noticed when I tried to put a new hard case on. Now I can't take this hard case off because the actual phone body is crumbling in chunks. So the phone body lasted 4 months before it began to crumble.

Q.One staff confirmation mentioned the phone body crumbling after a few months. Is this a common problem with this renewed model?

A.This is not likely a common problem, as most staff confirmation didn't mention the phone body crumbling. This phone was bought in August. Its May. So 9 months for $300. Since yesterday network failures off and on for days, now not on again. Four trips to Verizon with even an Esim card installed, network reset, updates are current, nothing. Blutooth no longer connects. When this does work the network cuts off in my own home and office. Also noteworthy, once the short term warranty expired the phone body began crumbling. I noticed when I tried to put a new hard case on. Now I can't take this hard case off because the actual phone body is crumbling in chunks. So the phone body lasted 4 months before it began to crumble.

Q.I am concerned about network failures and bluetooth connectivity. Has anyone else reported similar issues with this renewed phone?

A.Yes, at least one staff confirmation reported network failures, bluetooth connectivity issues, and the phone being identified as the source of the problem by tech support. If reliable network and bluetooth are critical for you, consider this feedback.

Q.I am concerned about network failures and bluetooth connectivity. Has anyone else reported similar issues with this renewed phone?

A.Yes, at least one staff confirmation reported network failures, bluetooth connectivity issues, and the phone being identified as the source of the problem by tech support. If reliable network and bluetooth are critical for you, consider this feedback.

#1

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SAMSUNG

Galaxy S24 Ultra SM-S928UZKFXAA

$1,419(incl. tax)Amazon price as of 2025-09-04

The Samsung Galaxy S24 Ultra features AI capabilities, a 200MP camera, and a Snapdragon 8 Gen 3 processor.

Display Size	6.8 inches	Display Resolution	3120 x 1440 pixels
RAM	12 GB	Storage Capacity	512 GB
Main Camera Resolution	200 MP	Front Camera Resolution	12 MP
Battery Capacity	- mAh	Operating System	Android 14, One UI 6.1
Processor	Snapdragon 8 Gen 3	5G Support	-
NFC Support	-	Water Resistance	-
Wi-Fi Standard	-

Wireless Charging FunctionWater Resistance FunctionExpandable Storage FunctionDual SIM FunctionReverse Wireless Charging FunctionHigh Refresh Rate Display Function

5.0Overall Rating

5.0Processor Performance

5.0RAM (Random Access Memory)

5.0Storage Capacity

5.0Camera Quality

5.0Display Quality

5.0Battery Life

5.0Manufacturer Reliability and Warranty

5.0Cost Performance

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#2

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SAMSUNG

Galaxy S25 Ultra 5G SM-S938B

$1,090(incl. tax)Amazon price as of 2025-09-03

The SAMSUNG Galaxy S25 Ultra 5G is a high-end smartphone with advanced features and powerful performance.

Display Size	6.9 inches	Display Resolution	3120 x 1440 pixels
RAM	12 GB	Storage Capacity	512 GB
Main Camera Resolution	200.0 MP	Front Camera Resolution	12.0 MP
Battery Capacity	5000 mAh	Operating System	Android 15
Processor	Qualcomm Snapdragon 8 Elite	5G Support	Yes
NFC Support	-	Water Resistance	-
Wi-Fi Standard	-

Wireless Charging FunctionWater Resistance FunctionExpandable Storage FunctionDual SIM FunctionReverse Wireless Charging FunctionHigh Refresh Rate Display Function

5.0Overall Rating

5.0Processor Performance

5.0RAM (Random Access Memory)

5.0Storage Capacity

5.0Camera Quality

5.0Display Quality

5.0Battery Life

5.0Manufacturer Reliability and Warranty

5.0Cost Performance

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#3

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Samsung

Galaxy S25 Ultra SM-S938UZKEXAA

$1,169(incl. tax)Amazon price as of 2025-09-03

The Samsung Galaxy S25 Ultra features advanced AI, a Snapdragon 8 Elite processor, and a built-in S Pen.

Display Size	6.9 inches	Display Resolution	2560 x 1440 pixels
RAM	12 GB	Storage Capacity	512 GB
Main Camera Resolution	- MP	Front Camera Resolution	- MP
Battery Capacity	5000 mAh	Operating System	Android 15, One UI 7
Processor	Snapdragon 8 Elite	5G Support	-
NFC Support	-	Water Resistance	-
Wi-Fi Standard	-

Wireless Charging FunctionWater Resistance FunctionExpandable Storage FunctionDual SIM FunctionReverse Wireless Charging FunctionHigh Refresh Rate Display Function

4.9Overall Rating

5.0Processor Performance

5.0RAM (Random Access Memory)

5.0Storage Capacity

5.0Camera Quality

5.0Display Quality

5.0Battery Life

5.0Manufacturer Reliability and Warranty

4.5Cost Performance

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#4

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SAMSUNG

Galaxy S25 Ultra SM-S938B/DS

$1,083(incl. tax)Amazon price as of 2025-09-04

The SAMSUNG Galaxy S25 Ultra is a high-end AI smartphone with a large display and advanced features.

Display Size	6.9 inches	Display Resolution	3120 x 1440 pixels
RAM	12 GB	Storage Capacity	512 GB
Main Camera Resolution	- MP	Front Camera Resolution	- MP
Battery Capacity	- mAh	Operating System	Android 14
Processor	Others	5G Support	-
NFC Support	-	Water Resistance	-
Wi-Fi Standard	-

Wireless Charging FunctionWater Resistance FunctionExpandable Storage FunctionDual SIM FunctionReverse Wireless Charging FunctionHigh Refresh Rate Display Function

4.9Overall Rating

5.0Processor Performance

5.0RAM (Random Access Memory)

5.0Storage Capacity

5.0Camera Quality

5.0Display Quality

4.5Battery Life

5.0Manufacturer Reliability and Warranty

4.5Cost Performance

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#5

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SAMSUNG

Galaxy S24 Ultra SM-S928B

$825(incl. tax)Amazon price as of 2025-09-03

The SAMSUNG Galaxy S24 Ultra features AI, a 200MP camera, long battery life, and the S Pen for enhanced productivity.

Display Size	6.8 inches	Display Resolution	2560 x 1440 pixels
RAM	12 GB	Storage Capacity	256 GB
Main Camera Resolution	200 MP	Front Camera Resolution	- MP
Battery Capacity	- mAh	Operating System	Android
Processor	1.2GHz Cortex A13 Processor	5G Support	-
NFC Support	-	Water Resistance	IP68
Wi-Fi Standard	-

Wireless Charging FunctionWater Resistance FunctionExpandable Storage FunctionDual SIM FunctionReverse Wireless Charging FunctionHigh Refresh Rate Display Function

4.8Overall Rating

4.8Processor Performance

5.0RAM (Random Access Memory)

5.0Storage Capacity

5.0Camera Quality

5.0Display Quality

4.5Battery Life

5.0Manufacturer Reliability and Warranty

4.5Cost Performance

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Samsung Electronics Samsung Galaxy S21 Ultra 5G SM-G998UZKAXAA

Product Overview

Product Specifications

Size & Weight

Features

SHOPSTAFF Rating Score

Brand & Manufacturer Details

Considerations

Recommended For

Not Recommended For

Suitable For

Not Suitable For

Frequently Asked Questions (FAQ)