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Samsung Galaxy S21 Ultra 5G 128GB - Phantom Black
Samsung Galaxy S21 Ultra 5G 128GB - Phantom Black
Samsung Galaxy S21 Ultra 5G 128GB - Phantom Black
Samsung Galaxy S21 Ultra 5G 128GB - Phantom Black
Samsung Galaxy S21 Ultra 5G 128GB - Phantom Black
Samsung Galaxy S21 Ultra 5G 128GB - Phantom Black
Samsung Galaxy S21 Ultra 5G 128GB - Phantom Black
Samsung Galaxy S21 Ultra 5G 128GB - Phantom Black
Samsung Galaxy S21 Ultra 5G 128GB - Phantom Black
Samsung Galaxy S21 Ultra 5G 128GB - Phantom Black
Samsung Galaxy S21 Ultra 5G 128GB - Phantom Black
Samsung Galaxy S21 Ultra 5G 128GB - Phantom Black
Samsung Galaxy S21 Ultra 5G 128GB - Phantom Black

Samsung Galaxy S21 Ultra 5G 128GB - Phantom Black

$275.00

(9,312 reviews)

See clearly in the sun with our brightest screen ever*. The stunning 6.8” intelligent display is designed to constantly adjust the blue light filter to help care for your eyes. Our toughest display ever, the 120Hz display makes scrolling feel oh-so-smooth and adaptive screen performance to reduce battery strain.

See clearly in the sun with our brightest screen ever*. The stunning 6.8” intelligent display is designed to constantly adjust the blue light filter to help care for your eyes. Our toughest display ever, the 120Hz display makes scrolling feel oh-so-smooth and adaptive screen performance to reduce battery strain.

Samsung Galaxy S21 Ultra 5G 128GB - Phantom Black

(9,312 reviews)

See clearly in the sun with our brightest screen ever*. The stunning 6.8” intelligent display is designed to constantly adjust the blue light filter to help care for your eyes. Our toughest display ever, the 120Hz display makes scrolling feel oh-so-smooth and adaptive screen performance to reduce battery strain.

See clearly in the sun with our brightest screen ever*. The stunning 6.8” intelligent display is designed to constantly adjust the blue light filter to help care for your eyes. Our toughest display ever, the 120Hz display makes scrolling feel oh-so-smooth and adaptive screen performance to reduce battery strain.

$275.00 - $1,849.00

in 17 offers

The lowest price for Samsung Galaxy S21 Ultra 5G 128GB - Phantom Black right now is $275.00 at eBay.com.au, compared across 9 retailers.

The all-time low was $6.00 on 2 Mar 2026 — today's price is 4483% above the lowest ever. It has been notably cheaper before — worth setting a price alert.

Prices last updated 12 May 2026.

Capacity:

256 GB
512 GB

Price comparison

Price data powered by pricesAPI.io

Last updated at 12/05/2026 19:37:39

Please note: price history and price alerts are not available for some stores, including Amazon.com.au.
eBay.com.au

$275.00

Samsung Galaxy S21 Ultra 5g - 128gb - Phantom Black (unlocked) [see

Delivery $13.95

Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!

eBay.com.au

$736.62

Samsung Galaxy S21 Ultra 5g Sm-g998b - 128gb - Phantom Black

Delivery $14.50

Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!

Mobile Guru

$379.00

Samsung Galaxy S21 Ultra 5G 128GB Phantom Black - 24 Months Warranty

Free delivery

Mobile Guru

$419.00

Samsung Galaxy S21 Ultra 5G 128GB Phantom Black - 24 Months Warranty

Free delivery

Mobile Guru

$429.00

Samsung Galaxy S21 Ultra 5G 128GB Phantom Black - 24 Months Warranty

Free delivery

Mobile Guru

$449.00

Samsung Galaxy S21 Ultra 5G 128GB Phantom Black - 24 Months Warranty

Free delivery

Mobile Guru

$479.00

Samsung Galaxy S21 Ultra 5G 128GB Phantom Black - 24 Months Warranty

Free delivery

Mobileciti

$388.00

Samsung Galaxy S21 Ultra 5G 128GB Black [Refur] - As New

Free next-day delivery

Mobileciti

$399.00

Samsung Galaxy S21 Ultra 5G 128GB Black [Open Box] - As New

Free next-day delivery

Mobileciti

$598.00

Samsung Galaxy S21 Ultra 5G (128GB/12GB, 6.8'', VF) - Phantom Black

Free next-day delivery

Price history

Price history

Please note: price history and price alerts are not available for some stores, including Amazon.com.au.

Reviews

5G is the worst; Reviews are mainly promotional reviews
13 June 2022burgess6510

originally posted on vzw.com

If you look at the reviews for this phone, past the first page all of them are part of a promotion. I love Samsung, but their phones are getting worse. I reluctantly upgrade from a 9 and I have regretted it ever since. 5G does not exist and if it does, it's a joke. I live in the mountains and my 9 connected everywhere, this new phone I cannot make calls or get text messages unless I'm out of the mountains. That's not the phone's fault, what is the fault of the phone is that I cannot make a call on the network. I get kicked off the Verizon network multiple times a day, so I can only make wireless calls and texts. I value my time too much to go down or call Verizon and spend hours trying to fix it, so I live with it. I have to reset my phone at least once a week ... MoreIf you look at the reviews for this phone, past the first page all of them are part of a promotion. I love Samsung, but their phones are getting worse. I reluctantly upgrade from a 9 and I have regretted it ever since. 5G does not exist and if it does, it's a joke. I live in the mountains and my 9 connected everywhere, this new phone I cannot make calls or get text messages unless I'm out of the mountains. That's not the phone's fault, what is the fault of the phone is that I cannot make a call on the network. I get kicked off the Verizon network multiple times a day, so I can only make wireless calls and texts. I value my time too much to go down or call Verizon and spend hours trying to fix it, so I live with it. I have to reset my phone at least once a week otherwise I will not receive calls or texts. My phone does not automatically switch from network to wi-fi, I have to do that manually. On the plus side, it takes great pics and it's fast and holds a charge for a long time. I never use the plug-in charger, I use a charging pad. It is a great size and the volume controls are great, no issues hearing someone on speaker. However the speaker for my ear is oddly high up on the phone, so I have to hold the phone really low so my ear is on the speaker, that was the first odd thing I noticed about this phone. Also updates, dear God, enough with the weekly updates. I am not joking, this phone gets updated at least once a month now, but when I first got it, it was every 10 days, a new update.

Fantastic device!
23 October 2022magzredzz

originally posted on samsung.com

This is the nicest phone I've ever owned. I've owned several galaxies throughout my life and while they've a been fanatic, this is the best. I bought this phone after living with the iPhone XS Max for two and a half years. My timed with the iPhone solidified my loyalty to Samsung, it was horrible. The husband and I both bought the same phone, two galaxy watches, a tablet, and we are planning on buying galaxy buds because of how fantastic this phone is. The videos are incredibly clear, the pictures are perfect, the speakers are phenomenal, the display and screen are beautiful. There are so many fantastic things about this phone, I cannot fathom why anyone would choose to buy an Apple product with devices such as these on the market. We are galaxy users for life.We ... MoreThis is the nicest phone I've ever owned. I've owned several galaxies throughout my life and while they've a been fanatic, this is the best. I bought this phone after living with the iPhone XS Max for two and a half years. My timed with the iPhone solidified my loyalty to Samsung, it was horrible. The husband and I both bought the same phone, two galaxy watches, a tablet, and we are planning on buying galaxy buds because of how fantastic this phone is. The videos are incredibly clear, the pictures are perfect, the speakers are phenomenal, the display and screen are beautiful. There are so many fantastic things about this phone, I cannot fathom why anyone would choose to buy an Apple product with devices such as these on the market. We are galaxy users for life.We will never use anything but the Galaxy S series going forward, I look forward to the S23 and buying more galaxy products!Here are some photos from my phone:

Great phone for the most part
21 December 2022AngiePants

originally posted on samsung.com

The S21 Ultra is a good phone for the most part!Pros: Great camera which takes crystal clear photos and offers various editing features. It even has this multi-take feature where it takes multiple pics during a session just like a photo shoot!The storage capacity of the phone is fantastic, edpecially if you're a person with lots of pictures, documents and videos on your phone. I use lots of Bible-based videos in my ministry, so this phone meets my needs very well with storage capacity and clarity of videos.The phone is quite customizable. Various themes are made available at no cost regarding the interface of the phone.Aesthetically speaking, the S21 Ultra is very sleek and pleasing to the eye. I have the phantom silver one and it has such a classy look. ... MoreThe S21 Ultra is a good phone for the most part!Pros: Great camera which takes crystal clear photos and offers various editing features. It even has this multi-take feature where it takes multiple pics during a session just like a photo shoot!The storage capacity of the phone is fantastic, edpecially if you're a person with lots of pictures, documents and videos on your phone. I use lots of Bible-based videos in my ministry, so this phone meets my needs very well with storage capacity and clarity of videos.The phone is quite customizable. Various themes are made available at no cost regarding the interface of the phone.Aesthetically speaking, the S21 Ultra is very sleek and pleasing to the eye. I have the phantom silver one and it has such a classy look. Tons of cases available out there for the phone as well...I should know I have 16 of them...Features on the phone function swiftly and seamlessly as well.Con: Over time the battery life of the phone has become increasingly less. Even while using battery saver mode, the battery life drains way too fast.Other than the battery life drainage being a little disappointing, the phone is overall a great device. It is my mini pocket assistant!

Specification

General
Product TypeSmartphone
Manufacturer Model NumberSM-G998B
Form FactorTouch
ProtectionDustproof, splashproof, water-resistant

Price comparison

Updated about 2 months ago
Please note: price history and price alerts are not available for some stores, including Amazon.com.au.
eBay.com.au

$275.00

Samsung Galaxy S21 Ultra 5g - 128gb - Phantom Black (unlocked) [see

Delivery $13.95

Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!

eBay.com.au

$736.62

Samsung Galaxy S21 Ultra 5g Sm-g998b - 128gb - Phantom Black

Delivery $14.50

Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!

Mobile Guru

$379.00

Out of stock

Samsung Galaxy S21 Ultra 5G 128GB Phantom Black - 24 Months Warranty

Free delivery

Mobile Guru

$419.00

Out of stock

Samsung Galaxy S21 Ultra 5G 128GB Phantom Black - 24 Months Warranty

Free delivery

Mobile Guru

$429.00

Out of stock

Samsung Galaxy S21 Ultra 5G 128GB Phantom Black - 24 Months Warranty

Free delivery

Price history

Price history

Please note: price history and price alerts are not available for some stores, including Amazon.com.au.

Reviews

5G is the worst; Reviews are mainly promotional reviews
13 June 2022

If you look at the reviews for this phone, past the first page all of them are part of a promotion. I love Samsung, but their phones are getting worse. I reluctantly upgrade from a 9 and I have regretted it ever since. 5G does not exist and if it does, it's a joke. I live in the mountains and my 9 connected everywhere, this new phone I cannot make calls or get text messages unless I'm out of the mountains. That's not the phone's fault, what is the fault of the phone is that I cannot make a call on the network. I get kicked off the Verizon network multiple times a day, so I can only make wireless calls and texts. I value my time too much to go down or call Verizon and spend hours trying to fix it, so I live with it. I have to reset my phone at least once a week ... MoreIf you look at the reviews for this phone, past the first page all of them are part of a promotion. I love Samsung, but their phones are getting worse. I reluctantly upgrade from a 9 and I have regretted it ever since. 5G does not exist and if it does, it's a joke. I live in the mountains and my 9 connected everywhere, this new phone I cannot make calls or get text messages unless I'm out of the mountains. That's not the phone's fault, what is the fault of the phone is that I cannot make a call on the network. I get kicked off the Verizon network multiple times a day, so I can only make wireless calls and texts. I value my time too much to go down or call Verizon and spend hours trying to fix it, so I live with it. I have to reset my phone at least once a week otherwise I will not receive calls or texts. My phone does not automatically switch from network to wi-fi, I have to do that manually. On the plus side, it takes great pics and it's fast and holds a charge for a long time. I never use the plug-in charger, I use a charging pad. It is a great size and the volume controls are great, no issues hearing someone on speaker. However the speaker for my ear is oddly high up on the phone, so I have to hold the phone really low so my ear is on the speaker, that was the first odd thing I noticed about this phone. Also updates, dear God, enough with the weekly updates. I am not joking, this phone gets updated at least once a month now, but when I first got it, it was every 10 days, a new update.

burgess6510 originally posted on vzw.com
Fantastic device!
23 October 2022

This is the nicest phone I've ever owned. I've owned several galaxies throughout my life and while they've a been fanatic, this is the best. I bought this phone after living with the iPhone XS Max for two and a half years. My timed with the iPhone solidified my loyalty to Samsung, it was horrible. The husband and I both bought the same phone, two galaxy watches, a tablet, and we are planning on buying galaxy buds because of how fantastic this phone is. The videos are incredibly clear, the pictures are perfect, the speakers are phenomenal, the display and screen are beautiful. There are so many fantastic things about this phone, I cannot fathom why anyone would choose to buy an Apple product with devices such as these on the market. We are galaxy users for life.We ... MoreThis is the nicest phone I've ever owned. I've owned several galaxies throughout my life and while they've a been fanatic, this is the best. I bought this phone after living with the iPhone XS Max for two and a half years. My timed with the iPhone solidified my loyalty to Samsung, it was horrible. The husband and I both bought the same phone, two galaxy watches, a tablet, and we are planning on buying galaxy buds because of how fantastic this phone is. The videos are incredibly clear, the pictures are perfect, the speakers are phenomenal, the display and screen are beautiful. There are so many fantastic things about this phone, I cannot fathom why anyone would choose to buy an Apple product with devices such as these on the market. We are galaxy users for life.We will never use anything but the Galaxy S series going forward, I look forward to the S23 and buying more galaxy products!Here are some photos from my phone:

magzredzz originally posted on samsung.com
Great phone for the most part
21 December 2022

The S21 Ultra is a good phone for the most part!Pros: Great camera which takes crystal clear photos and offers various editing features. It even has this multi-take feature where it takes multiple pics during a session just like a photo shoot!The storage capacity of the phone is fantastic, edpecially if you're a person with lots of pictures, documents and videos on your phone. I use lots of Bible-based videos in my ministry, so this phone meets my needs very well with storage capacity and clarity of videos.The phone is quite customizable. Various themes are made available at no cost regarding the interface of the phone.Aesthetically speaking, the S21 Ultra is very sleek and pleasing to the eye. I have the phantom silver one and it has such a classy look. ... MoreThe S21 Ultra is a good phone for the most part!Pros: Great camera which takes crystal clear photos and offers various editing features. It even has this multi-take feature where it takes multiple pics during a session just like a photo shoot!The storage capacity of the phone is fantastic, edpecially if you're a person with lots of pictures, documents and videos on your phone. I use lots of Bible-based videos in my ministry, so this phone meets my needs very well with storage capacity and clarity of videos.The phone is quite customizable. Various themes are made available at no cost regarding the interface of the phone.Aesthetically speaking, the S21 Ultra is very sleek and pleasing to the eye. I have the phantom silver one and it has such a classy look. Tons of cases available out there for the phone as well...I should know I have 16 of them...Features on the phone function swiftly and seamlessly as well.Con: Over time the battery life of the phone has become increasingly less. Even while using battery saver mode, the battery life drains way too fast.Other than the battery life drainage being a little disappointing, the phone is overall a great device. It is my mini pocket assistant!

AngiePants originally posted on samsung.com
My Last Samsung Phone (not in a good way)
6 October 2022

I am not with AT&T, but this was the only option for the S21 Ultra 128gb. I purchased this phone from Samsung unlocked. My biggest complaint is the lack of expandable storage - I could not migrate my Note 20 to this phone because 128GB wasn't nearly enough. FYI - the better the camera, the more powerful the specs, the more storage the phone will need. Eliminating expandable storage on a flagship phone is such a step in the wrong direction that I will never purchase another. I also had to switch my UI because the Samsung UI randomly reset my short cuts so they no longer worked. They've been made aware of this problem by many users, but have yet to fix it. I love the idea of an amazing phone camera, but if the phone has limited storage those huge files are a ... MoreI am not with AT&T, but this was the only option for the S21 Ultra 128gb. I purchased this phone from Samsung unlocked. My biggest complaint is the lack of expandable storage - I could not migrate my Note 20 to this phone because 128GB wasn't nearly enough. FYI - the better the camera, the more powerful the specs, the more storage the phone will need. Eliminating expandable storage on a flagship phone is such a step in the wrong direction that I will never purchase another. I also had to switch my UI because the Samsung UI randomly reset my short cuts so they no longer worked. They've been made aware of this problem by many users, but have yet to fix it. I love the idea of an amazing phone camera, but if the phone has limited storage those huge files are a liability. Forcing users to a cloud model where content can basically be held hostage, either by design (terrible download options) or future monetization is something I refuse to participate in. Long time Samsung user breaking up with you after Note 8, Note 9, Note 20, S21 Ultra, Tab A, Tab S7+, several earbuds and Galaxy Watches 1st gen, 3, 4, and 5. It's not me - it's you...

Donali219 originally posted on samsung.com
NOT unlocked!!!
14 March 2023

I purchased this unlocked phone for my daughter. Used unlocked S21 for $400, sure. She needed an upgrade from the cracked S8+ she's been using. Looked into model numbers, compatible with our carrier (AT&T). Received it quickly, was available to pick up at the store 2 days ahead of the estimated time. It had a scratch on the screen, but eh, it's a used device and considerably cheaper than buying a "renewed" one straight from Samsung. Got home, charged the device, turned it on...T-Mobile logo pops up. Odd. Ok, maybe just because that's the carrier it was used with before? Got through setting it up and transferring everything from her old phone... nope. Error popped up saying that it was carrier locked and out could not be used with our AT&T SIM card. Returned it to ... MoreI purchased this unlocked phone for my daughter. Used unlocked S21 for $400, sure. She needed an upgrade from the cracked S8+ she's been using. Looked into model numbers, compatible with our carrier (AT&T). Received it quickly, was available to pick up at the store 2 days ahead of the estimated time. It had a scratch on the screen, but eh, it's a used device and considerably cheaper than buying a "renewed" one straight from Samsung. Got home, charged the device, turned it on...T-Mobile logo pops up. Odd. Ok, maybe just because that's the carrier it was used with before? Got through setting it up and transferring everything from her old phone... nope. Error popped up saying that it was carrier locked and out could not be used with our AT&T SIM card. Returned it to the store (online customer service was a joke), and got my refund. Reordered another... Attempting ONE more time. It will be here tomorrow. If this doesn't work, I'll be sorbitol the extra $ to order from Samsung instead. Beyond fed up at this point. I've NEVER had an issue purchasing anything from Best Buy before--not even a refurbished laptop--but apparently these phones are not coming from Best Buy... they're being purchased directly from an independent 3rd party and not being tested by Best Buy beforehand.

PerpetuallySquirrelin originally posted on bestbuy.com
Not happy, not functional space wise
25 April 2022

So the cameras were the reason I really needed the phone for the documentation of travel and organizations I work with.It was not effectively noted this phone doesn't have SD card slot I didn't know until I got it, and not extra ports for plugs ins I would use.Since having this phone daily it is out of storage forcing me to upload to cloud and. Decided what to delete. Apps I need I have had to delete to create space and apps running taking half the space or more which I don't actually have a lot of apps they are used for editing it commutation.When I upload to the cloud it doesn't save it into the albums I have already created on phone to keep it organized.It's been a mess and absolutely didn't experience this when I had phones that had SD card slots.This ... MoreSo the cameras were the reason I really needed the phone for the documentation of travel and organizations I work with.It was not effectively noted this phone doesn't have SD card slot I didn't know until I got it, and not extra ports for plugs ins I would use.Since having this phone daily it is out of storage forcing me to upload to cloud and. Decided what to delete. Apps I need I have had to delete to create space and apps running taking half the space or more which I don't actually have a lot of apps they are used for editing it commutation.When I upload to the cloud it doesn't save it into the albums I have already created on phone to keep it organized.It's been a mess and absolutely didn't experience this when I had phones that had SD card slots.This is a HUGE draw back and regret this choice of phone for that reason. SD cards slots are beneficial and should have been clearly noted better. When you market camera qualities but fail to mention storage is not functional for those who need it. Deceptive to say the least had to purchase more cloud space and it doesn't even keep my stuff organized as I had it on phone and that is all functional to what I need.Daily lack of storage is unacceptable and taking away SD card options to your phones is a bad idea

Marsha originally posted on vzw.com
The Best 5G phone even a year later
31 October 2022

Samsung makes quality products that are durable. With frequent updates my phone always has the latest Android version so I can enjoy the latest features. I love the cameras on my S21 Ultra 5G. Thy take stunning photos even in dark environments. Being one of the most popular phones, it's easy to find any type of accessories and cases that you need. The display is great it has a 120Hz refresh rate for smooth scrolling. The battery is big enough for all day use, even a year later. I never find myself having to change my phone throughout the day. I only charge it when I go to sleep. I watch some videos online, use social media and listen to music and I still have about 30% at the end of the night. It's a great feeling, I feel safe having that peace of mind that my phone ... MoreSamsung makes quality products that are durable. With frequent updates my phone always has the latest Android version so I can enjoy the latest features. I love the cameras on my S21 Ultra 5G. Thy take stunning photos even in dark environments. Being one of the most popular phones, it's easy to find any type of accessories and cases that you need. The display is great it has a 120Hz refresh rate for smooth scrolling. The battery is big enough for all day use, even a year later. I never find myself having to change my phone throughout the day. I only charge it when I go to sleep. I watch some videos online, use social media and listen to music and I still have about 30% at the end of the night. It's a great feeling, I feel safe having that peace of mind that my phone is not dead because I use my phone for everything: as a keyless entry, to pay using Samsung Pay, to order an ride, to make calls, for directions. It's a great phone and a great investment because it will last several years and you won't need to buy another phone during that time.

Galand92 originally posted on samsung.com

Specification

General
Product TypeSmartphone
Manufacturer Model NumberSM-G998B
Form FactorTouch
ProtectionDustproof, splashproof, water-resistant

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