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Smartphone comparison

Samsung Galaxy Z Flip4 Refurbished vs Samsung Galaxy S21 Plus Refurbished

Compare cameras, battery, screen and everyday features.

Compared products
01Selected
Samsung Galaxy Z Flip4 Refurbished

Samsung Galaxy Z Flip4 Refurbished

  • 187 g.
  • About 6.7 inch screen.
  • Qualcomm SM8475 Snapdragon 8+ Gen 1 (4 nm) processor.
  • 8 GB RAM in this version.
  • 512 GB storage in this version.
KSh 39,000In Stock
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02
Samsung Galaxy S21 Plus Refurbished

Samsung Galaxy S21 Plus Refurbished

  • About 6.7 inch screen.
  • Mali-G78 MP14 - International, Adreno 660 - USA/China graphics.
  • 8 GB RAM in this version.
  • 256 GB storage in this version.
  • 4,800 mAh battery capacity.
KSh 38,000In Stock
Add to cart

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2 spaces available

Motorola S50 NeoKSh 37,500
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Redmi Note 15 Pro 5GKSh 38,000
Nothing Phone 3aKSh 39,300
2 of 4 products

Our quick verdict

With the same 6.7-inch OLED screen, 8 GB of RAM and 12 MP main camera, the Samsung Galaxy S21 Plus Refurbished has a bigger battery (4,800 mAh), optical zoom and 8K video recording and offers FM radio (Snapdragon model only, while the Samsung Galaxy Z Flip4 Refurbished has more storage (512 GB) and is lighter (187 g) and slimmer.

Display

Samsung Galaxy Z Flip4 Refurbished
1080 x 2640 pixels (~426 ppi density)
Samsung Galaxy S21 Plus Refurbished
1080 x 2400 pixels, 20:9 ratio (~394 ppi density)

Performance

Samsung Galaxy Z Flip4 Refurbished
Adreno 730 graphics
Samsung Galaxy S21 Plus Refurbished
Mali-G78 MP14 - International Adreno 660 - USA/China graphics

Storage

Samsung Galaxy Z Flip4 Refurbished
512 GB storage in this version
Samsung Galaxy S21 Plus Refurbished
256 GB storage in this version

Battery capacity

Samsung Galaxy Z Flip4 Refurbished
3,700 mAh battery capacity
Samsung Galaxy S21 Plus Refurbished
4,800 mAh battery capacity

Weight

Samsung Galaxy Z Flip4 Refurbished
187 g
Samsung Galaxy S21 Plus Refurbished
200 g

Key differences

The main differences to help you choose.

Samsung Galaxy Z Flip4 Refurbished

  • More storage: 512 GB (vs 256 GB).
  • Newer Bluetooth 5.2 (vs 5.0).
  • Lighter: 187 g (vs 200 g).
  • Slimmer: 6.9 mm thick (vs 7.8 mm).
  • Newer Android 12 (vs Android 11).

Samsung Galaxy S21 Plus Refurbished

  • Bigger battery: 4,800 mAh (vs 3,700 mAh).
  • Telephoto camera with 1.1x optical zoom.
  • FM radio (Snapdragon model only.
  • 8K video recording (vs 4K).
  • Lower price: KSh 38,000 (vs KSh 39,000).

What matters most to you?

Choose any priorities

How each product answers the questions buyers ask most. Tick a topic to add it, untick one to hide it.

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6 priorities selected.
How each product answers the selected priorities
PrioritySamsung Galaxy Z Flip4 RefurbishedSamsung Galaxy S21 Plus Refurbished
Display6.7-inch OLED display, 120 Hz, 426 ppi6.7-inch OLED display, 120 Hz, 394 ppi
Camera12 MP main camera with OIS12 MP main camera with OIS, plus a 1.1x telephoto camera
PerformanceQualcomm Snapdragon 8+ Gen 1 processorExynos 2100 processor
Storage512 GB storage256 GB storage
Battery capacity3,700 mAh battery4,800 mAh battery
Weight187 g200 g

Detailed comparison

Explore the full specifications, section by section.

General

General specifications comparison
SpecificationSamsung Galaxy Z Flip4 RefurbishedSamsung Galaxy S21 Plus Refurbished
BrandSamsungSamsung
ModelGalaxy Z Flip4Galaxy S21 Plus
Announced2022, August 102021, January 14
Device type / form familySmartphoneSmartphone
Release statusAvailable. Released 2022, August 25Available. Released 2021, January 29
Model numbersSM-F721B, SM-F721B/DS, SM-F721N, SM-F721U, SM-F721U1, SM-F721W, SM-F7210SM-G996B, SM-G996B/DS, SM-G996U, SM-G996U1, SM-G996W, SM-G996N, SM-G9960

Design

Design specifications comparison
SpecificationSamsung Galaxy Z Flip4 RefurbishedSamsung Galaxy S21 Plus Refurbished
DimensionsUnfolded: 165.2 x 71.9 x 6.9 mm Folded: 84.9 x 71.9 x 15.9-17.1 mm161.5 x 75.6 x 7.8 mm (6.36 x 2.98 x 0.31 in)
Weight187 g (6.60 oz)200 g (Sub6), 202 g (mmWave) (7.05 oz)
Build materialsPlastic front (unfolded), glass back (Gorilla Glass Victus+), aluminum frameGlass front (Gorilla Glass Victus), glass back (Gorilla Glass Victus), aluminum frame
Form factorFoldable smartphoneTouchscreen smartphone

Display

Display specifications comparison
SpecificationSamsung Galaxy Z Flip4 RefurbishedSamsung Galaxy S21 Plus Refurbished
DisplayFoldable Dynamic AMOLED 2X, 120Hz, HDR10+, 1200 nits (peak); 6.7 inches, 101.5 cm2 (~85.4% screen-to-body ratio)Dynamic AMOLED 2X, 120Hz, HDR10+, 1300 nits (peak); 6.7 inches, 107.8 cm^{2} (~88.3% screen-to-body ratio)
Cover displaySuper AMOLED, 1.9 inches, 260 x 512 pixels (Gorilla Glass Victus+)—
Screen resolution1080 x 2640 pixels (~426 ppi density)1080 x 2400 pixels, 20:9 ratio (~394 ppi density)
Display featuresFoldable Dynamic AMOLED 2X, 120Hz, HDR10+, 1200 nits (peak)Dynamic AMOLED 2X, 120Hz, HDR10+, 1300 nits (peak)
Display technologyFoldable Dynamic AMOLED 2X, 120Hz, HDR10+, 1200 nits (peak)Dynamic AMOLED 2X, 120Hz, HDR10+, 1300 nits (peak)
Display size6.7 inches, 101.5 cm2 (~85.4% screen-to-body ratio)6.7 inches, 107.8 cm^{2} (~88.3% screen-to-body ratio)
Refresh rate120Hz120Hz
Display protection—Corning Gorilla Glass Victus

Performance

Performance specifications comparison
SpecificationSamsung Galaxy Z Flip4 RefurbishedSamsung Galaxy S21 Plus Refurbished
ProcessorQualcomm SM8475 Snapdragon 8+ Gen 1 (4 nm)Exynos 2100 (5 nm) - International Qualcomm SM8350 Snapdragon 888 5G (5 nm) - USA/China
CPUOcta-core (1x3.19 GHz Cortex-X2 & 3x2.75 GHz Cortex-A710 & 4x1.80 GHz Cortex-A510)Octa-core (1x2.9 GHz Cortex-X1 & 3x2.80 GHz Cortex-A78 & 4x2.2 GHz Cortex-A55) - International Octa-core (1x2.84 GHz Cortex-X1 & 3x2.42 GHz Cortex-A78 & 4x1.80 GHz Cortex-A55) - USA/China
GPUAdreno 730Mali-G78 MP14 - International Adreno 660 - USA/China

Memory & Storage

Memory & Storage specifications comparison
SpecificationSamsung Galaxy Z Flip4 RefurbishedSamsung Galaxy S21 Plus Refurbished
RAM8GB8GB
Storage512GB256GB
Storage technologyUFS 3.1UFS 3.1
Expandable storageNoNo

Cameras

Cameras specifications comparison
SpecificationSamsung Galaxy Z Flip4 RefurbishedSamsung Galaxy S21 Plus Refurbished
Rear camera12 MP, f/1.8, 24mm (wide), 1/1.76", 1.8µm, dual pixel PDAF, OIS 12 MP, f/2.2, 13mm, 123˚ (ultrawide), 1/3.06", 1.12µm12 MP, f/1.8, 26mm (wide), 1/1.76", 1.8µm, dual pixel PDAF, OIS 64 MP, f/2.0, 29mm (telephoto), 1/1.72", 0.8µm, PDAF, OIS, 1.1x optical zoom, 3x hybrid zoom 12 MP, f/2.2, 13mm, 120˚ (ultrawide), 1/2.55" 1.4µm, Super Steady video
Front camera10 MP, f/2.4, 26mm (wide), 1/3.0", 1.22µm10 MP, f/2.2, 26mm (wide), 1/3.24", 1.22µm, dual pixel PDAF
Rear camera featuresLED flash, HDR, panoramaLED flash, auto-HDR, panorama
Rear camera video4K@30/60fps, 1080p@60/240fps, HDR10+8K@24fps, 4K@30/60fps, 1080p@30/60/120/240fps, HDR10+, stereo sound rec., gyro-EIS
Front camera featuresHDRHDR
Front camera video4K@30fps4K@30/60fps, 1080p@30fps

Battery & Charging

Battery & Charging specifications comparison
SpecificationSamsung Galaxy Z Flip4 RefurbishedSamsung Galaxy S21 Plus Refurbished
BatteryLi-Po 3700 mAhLi-Ion 4800 mAh
Charging25W wired, 50% in 30 min 15W wireless 4.5W reverse wireless25W wired, PD3.0 15W wireless (Qi) 4.5W reverse wireless

Software

Software specifications comparison
SpecificationSamsung Galaxy Z Flip4 RefurbishedSamsung Galaxy S21 Plus Refurbished
Operating systemAndroid 12, upgradable to Android 16, One UI 8Android 11, up to 4 major OS updates, One UI 7

Network

Network specifications comparison
SpecificationSamsung Galaxy Z Flip4 RefurbishedSamsung Galaxy S21 Plus Refurbished
NetworkGSM / CDMA / HSPA / EVDO / LTE / 5GGSM / CDMA / HSPA / EVDO / LTE / 5G
SIMNano-SIM + eSIM· Nano-SIM + eSIM · Nano-SIM + Nano-SIM + eSIM (max 2 at a time)
2G bandsGSM 850 / 900 / 1800 / 1900 CDMA 800 / 1900GSM 850 / 900 / 1800 / 1900 CDMA 800 / 1900 & TD-SCDMA
3G bandsHSDPA 850 / 900 / 1700(AWS) / 1900 / 2100 HSDPA 850 / 900 / 1900 / 2100 CDMA2000 1xEV-DOHSDPA 850 / 900 / 1700(AWS) / 1900 / 2100 CDMA2000 1xEV-DO
4G bands1, 2, 3, 4, 5, 7, 8, 12, 13, 17, 18, 19, 20, 25, 26, 28, 32, 38, 39, 40, 41, 661, 2, 3, 4, 5, 7, 8, 12, 13, 14, 18, 19, 20, 25, 26, 28, 30, 38, 39, 40, 41, 46, 48, 66, 71 - SM-G996U1 1, 2, 3, 4, 5, 7, 8, 12, 13, 17, 18, 19, 20, 25, 26, 28, 32, 38, 39, 40, 41, 66 - SM-G996B
5G bands1, 2, 3, 5, 7, 8, 12, 20, 25, 28, 38, 40, 41, 66, 75, 77, 78 SA/NSA/Sub6 - International SA/NSA/Sub6/mmWave - USA2, 5, 25, 41, 66, 71, 260, 261 SA/NSA/Sub6/mmWave - SM-G996U1 1, 3, 5, 7, 8, 20, 28, 38, 40, 41, 66, 77, 78 SA/NSA/Sub6 - SM-G996B
Network speedHSPA, LTE (6CA), 5GHSPA 42.2/5.76 Mbps, LTE (7CA) Cat20 2000/200 Mbps, 5G (5+ Gbps DL)

Connectivity

Connectivity specifications comparison
SpecificationSamsung Galaxy Z Flip4 RefurbishedSamsung Galaxy S21 Plus Refurbished
NFCYesYes
Bluetooth5.2, A2DP, LE5.0, A2DP, LE
Wi-FiWi-Fi 802.11 a/b/g/n/ac/6, dual-band, Wi-Fi DirectWi-Fi 802.11 a/b/g/n/ac/6, dual-band, Wi-Fi Direct
PositioningGPS, GLONASS, GALILEO, BDSGPS, GLONASS, BDS, GALILEO
RadioNoFM radio (Snapdragon model only; market/operator dependent)
USBUSB Type-C 2.0, OTGUSB Type-C 3.2, OTG
Ultra Wideband (UWB)—Supported

Features

Features specifications comparison
SpecificationSamsung Galaxy Z Flip4 RefurbishedSamsung Galaxy S21 Plus Refurbished
SensorsFingerprint (side-mounted), accelerometer, gyro, proximity, compass, barometerFingerprint (under display, ultrasonic), accelerometer, gyro, proximity, compass, barometer
Desktop mode—Samsung DeX, Samsung Wireless DeX (desktop experience support)

Audio

Audio specifications comparison
SpecificationSamsung Galaxy Z Flip4 RefurbishedSamsung Galaxy S21 Plus Refurbished
LoudspeakersYes, with stereo speakersYes, with stereo speakers
3.5 mm headphone jackNoNo
Audio featuresHigh-bitrate audio supportHigh-bitrate audio support

Refurbished unit information

Refurbished unit information specifications comparison
SpecificationSamsung Galaxy Z Flip4 RefurbishedSamsung Galaxy S21 Plus Refurbished
ConditionRefurbished / EX-UKRefurbished / EX-UK

Similarities

  • Both have 8 GB RAM.
  • Both have 120 Hz displays.
  • Both have optical image stabilisation.
  • Both support Wi-Fi 6.
  • Both have NFC.
  • Both have an aluminium frame.

In summary

For most buyers the Samsung Galaxy S21 Plus Refurbished is the better buy; the Samsung Galaxy Z Flip4 Refurbished makes sense if you want more storage.

Back to compared products ↑

In-stock alternatives

Redmi Note 15 Pro 4GFor Samsung Galaxy Z Flip4 RefurbishedRedmi Note 15 Pro 4GView product ↗Samsung Galaxy Note10 Plus 5G RefurbishedFor Samsung Galaxy Z Flip4 RefurbishedSamsung Galaxy Note10 Plus 5G RefurbishedView product ↗Samsung Galaxy S22 RefurbishedFor Samsung Galaxy S21 Plus RefurbishedSamsung Galaxy S22 RefurbishedView product ↗

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