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Samsung

Samsung Galaxy Z Flip 4 5G, US Version, 128GB, Blue - Unlocked (Renewed)

Based on 2,631 reviews
Condition: Refurbished - Excellent
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$225.00
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Availability: In Stock.
Fulfilled by Smart Resale CA
Arrives Friday, Nov 6
Order within 15 hours and 28 minutes

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At a glance

Condition
Refurbished - Excellent
Color
Blue
Service provider
Unlocked
Storage
128 GB
Product grade
Renewed
Model
Galaxy Z Flip 4
Memory
8 GB
Warranty
90 Day Limited Warranty

Features 1

  • The 6.7 Dynamic AMOLED 2X foldable main screen supports an adaptive 48120 Hz refresh rate and HDR10+, offering incredibly fluid motion for gaming, media playback, and split-screen multitasking when using Flex Mode.

Description

Introducing the Samsung Galaxy Z Flip 4 SM-F721U, a remarkable fusion of style and functionality. Elevating your smartphone experience with its innovative design, this device seamlessly combines cutting-edge technology with a sleek, compact form factor. With its revolutionary foldable display, the Galaxy Z Flip 4 offers a unique and immersive viewing experience. From streaming your favorite content to multitasking with multiple apps, the flexible screen adapts to your needs, providing unparalleled versatility.

Specs 51

Brand Samsung
Operating System Android
Ram Memory Installed Size 8 GB
CPU Model Snapdragon
CPU Speed 2.75 GHz
Memory Storage Capacity 128 GB
Screen Size 6.7 inches
Resolution 1080 x 2640

Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Friday, Nov 6

Yes, absolutely! You may return this product for a full refund within 90 days of receiving it.

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View our full returns policy here.

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Similar Products

Top Amazon Reviews

Still loving it after 2 years
Color: Graphite Service provider: Unlocked Memory Storage Capacity: 128 GB Product grade: Renewed
Almost 2 years later and I still love it. I will never go back to a non-foldable phone. It fits in my pocket as if it isn't even there. Being able flip it closed to end a call is great. Before this I had the first 2 versions of the Motorola Razor smartphone. The screens on both broke soon after purchase. The Galaxy has taken many falls that I thought for sure would crack the screen. Not one crack. After 2 years I am starting to notice the battery loosing a charge faster than before, but no different than any other phone I owned for this long. Even though there are now several newer versions it doesn't feel like old technology. It's fast and does everything I need it to do. Trust me, after you use a flip phone you won't want to go back. ... show more
Reviewed in the United States on October 16, 2026 by Eric Cobb
Unreliable hinge, bad product
Color: Graphite Service provider: T-Mobile Memory Storage Capacity: 256 GB Product grade: Renewed
This was my second Galaxy Flip4. My first I bought in June of 2023 direct from T-Mobile. In September it slipped out of my pocket while sitting in a chair, and it landed on a wood floor....so not a high fall and a fairly soft surface. The impact caused the hinge to misalign and the screen to detach. I did have it in a case at the time, but it was only a small piece of plastic covering the hinge. I decided it was just a "freak" occurence, and wanting to save some money, ordered another Flip4 since I liked the performance and features of the phone, especially it's smaller size in my pocket. I also ordered a better case that protected the hinge with a sturdier cover. Last week, for no reason at all (no drops or impacts) the hinge began to fail, and the screen began detaching from the phone. It's obvious that the hinge is a very weak design on these phones, and isn't built to last. You would think Samsung would have put more effort into making it reliable, but alas it's a typical "made to fail" product. Long story short: great idea, unreliable execution. If you buy one of these, get the insurance and fully expect a failure of the hinge and screen at some point. ... show more
Reviewed in the United States on June 3, 2024 by Amazon Customer
Protective phone case cover
Color: Graphite Service provider: Unlocked Memory Storage Capacity: 128 GB Product grade: Renewed
Good find, has adaptor for charging wireless, fit phone perfectly , unfortunately phone does not work but not the case cover fault , it is protective good material and light weight
Reviewed in the United States on September 29, 2026 by Mia K
Purchase was great
Color: Graphite Service provider: T-Mobile Memory Storage Capacity: 256 GB Product grade: Renewed
I purchased this phone back in January, its been just about 4 months. To start i purchased it at a lower price due to selecting one with cosmetic damage, didn't bother me, I know to read descriptions when buying used. My issue was that the phone actually didn't stay powered on and would only work when plugged in. Im giving 5 stars because the customer service was great. I was originally offered a refund but I needed a phone so I asked about an exchange instead. I forgot who I spoke with but they delivered. I got a phone at the same price point which had 0 defects. I almost thought it was brand new. After 4 months just about the phone is still good. I have 0 issues with battery, both screen work, the folding still feels tight and good etc. Again my exchange was used also, I expected there to be some cosmetic damage or scratches on screen etc but it came 100 percent flawless. I will be ordering again since my wife now wants one. ... show more
Reviewed in the United States on April 16, 2026 by Ryan
Very Happy!
Color: Bora Purple Service provider: Unlocked Memory Storage Capacity: 128 GB Product grade: Renewed
I want to say that I love the phone I got! Other than a little problem at the beginning with the phone not being unlocked but the company was awesome about the problem! They sent me a replacement & this one is very good! It looks good. I put my SIM card n & it worked perfectly! There's a little wear mark on the screen but u can't tell while it's lit up. I am very happy with the product & the seller! ... show more
Reviewed in the United States on October 10, 2025 by Carissa Harrison
First Renewed Experience, First Samsung Device
Color: Bora Purple Service provider: Unlocked Memory Storage Capacity: 128 GB Product grade: Renewed
This review is for the phone as well as the process of buying a Renewed item through Amazon. I purchased this phone because I could not find a phone that isn't massive but that still had the features and performance I require for daily use, so I decided to try this renewed Flip 4. The 90 day return policy and the great price convinced me to try it out. Not sure if I can name the seller in the review but I basically selected the phone in the best condition from the highest-rated seller fulfilled by Amazon. The phone arrived in blank packaging with a charging cable. It looks like there is a screen protector installed, plus there was a plastic film on top of the screen for packaging. It came half charged. The phone itself looks brand new. No detectable blemishes or signs of use. Hinge is nice and solid. Full charge was very fast (with fast charger). Setup fairly easy with Samsung transfer app but I am still missing a few passwords and accounts. I can manually add those later. There is a lot of bloatware from Samsung, plus carrier junk apps. (I think this is carrier unlocked- when I put my SIM it, it applied my carrier settings and apps.) Battery life (as expected-lots of info on this) is not great. I knew that going in. I am tracking battery usage throughout the day with different levels of use- screen open and closed, dormant or playing videos - and it seems as though this particular device doesn't deplete battery any more than would be typical for a phone this age. I suspect this particular phone was very gently used to begin with. Example: battery depleted about 10-15% overnight with no use, not plugged in. With heavier usage the battery use goes up to about 10% per hour. Not sure if there's anything I can adjust/disable to make this more efficient. My old phone would give me 1.5 to 2 days of a charge with regular use so this will be an adjustment. The screen is beautiful and easy to see. Samsung is an upgrade overall for me and I am pleased with how smooth it runs. Nice on-screen keyboard, etc. I am not tech savvy so there are probably too many customization options for me personally. I really just want a phone that works well for calls, that I can text on and use internet and maps periodically. This should do the job just fine. No SD storage and no headphone jack. I guess that's becoming customary. The device doesn't seem flimsy at all. That being said, I would get a case ASAP in the event of inadvertent drops - it happens. Signal and connection seem good, as does speaker quality. The fingerprint sensor is on the side near the volume buttons. Not sure I am crazy about this placement and it never registers the first time for me, but I think that's probably a user (me) problem. Overall I had a very good experience buying Renewed. Anyone who is interested in trying a flip smartphone, this is very economical option without a major commitment. I will update my review accordingly if, within 90 days, anything goes haywire on the device. ... show more
Reviewed in the United States on June 6, 2024 by Ok_Grid
Black line of death the cause of reliability issues
Color: Bora Purple Service provider: Unlocked Memory Storage Capacity: 128 GB Product grade: Renewed
Review Image by Corey
Review Image by Corey
Review Image by Corey
Review Image by Corey
Review Image by Corey
Review Image by Corey
Review Image by Corey
Review Image by Corey
Review Image by Corey
Review Image by Corey
Up to today, the phone has never been dropped (on hard surfaces), looks brand new as if it came out of the box besides a very small blemish to the right of the camera lens. The color is beautiful and matches what is shown online. The phone was very responsive and quick for multiple tasks, it even worked well on Genshin Impact (the game) besides getting a little on the warm side. I paid $299.99 (plus $18.00 tax totaling $317.99) June 22 2024. The phones screen started peeling and shortly after turning into a black line 8-9 months of ownership. As of today, ~16 months of ownership the black line grew to cover ~1 inch varying in size across the middle of the screen. (The progression of the peeling over ~7-8 months) The black line and above no longer responds to touch, only can see display above the black line. Under the black line works as it should. The touch screen not working on the top was discovered as of yesterday. I'm not sure of how many total reports there have been of this model of phone but with my experiences I would consider a different phone and perhaps avoid all of the Galaxy Z Flip or Fold phones. If you do consider to buy a Flip or Fold phone and expect it to last quite a bit longer than the warranty, while still being reliable, I highly advise to do your research. Sharing the steps I've taken so far... I've contacted Amazon. Seems they cant do much as its after a year of when I'm reporting this. I left a voicemail to Chubbiestech, the seller, to see what they can do. I will give Samsung a try as well as this problem is from a design flaw, not wear and tear. I also taken multiple pictures and a video of the phone and the phone case purchased for the phone to show the condition of the phone (phone looks brand new besides the screen where it is peeling and some finger prints on the sides) I would post the video however it is too big in size. The pictures shown are the phone along with the phone case. The case is scratched up a bit on the bottom left corner, however this only caused a cosmetic flaw to the case purchased separately for the phone. The case did its job protecting the phone for normal use excluding drops as the phone has never been dropped on hard surfaces. I'm sure its been lightly tossed on the bed, dropped into a pocket, and placed into a purse with other items that most likely caused the cosmetic flaw on the case. The phone has only been open while in use, so only fingers and weather touched the screen. A screen protector has never been applied to the phone. This is the first time I've ever had trouble with a product design itself sold on the Amazon platform out of 86 items. ... show more
Reviewed in the United States on October 31, 2025 by Corey
Great phone but you are on a deadline
Color: Graphite Service provider: Unlocked Memory Storage Capacity: 128 GB Product grade: Renewed
Love this phone Performance is good and the fold is cool But you do have a deadline on this phone with numerous issues with the screen thats well documented Mine started with hinge issues at about year in Closing the screen would instantly power off the phone, so the whole gimmick of it folding just didnt work after awhile, leaving me with a candy bar phone with a plastic screen i lived with it as the phone still functioned with equivalent performance to a S22 But at about the 14 month mark, i started getting a screen issue My screen would just refuse to turn on sometimes or would turn on to a yellow screen indicating a ribbon cable issue Now with my folding issue i assumed "okay i cant fold it so i just banged it the wrong way finally" but no the yellow screen or non responsive screen issue is very common on the flip 3 and 4s and relates to bad magnet sensors, driver issues, and ribbon degradation issues I dealt with it for a few more months since the issue began until my screen just finally gave out and replaced the phone Great phone but you are on a deadline ... show more
Reviewed in the United States on February 10, 2026 by Makaela Coleman
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