Sony Xperia U (ST25i) vs Xiaomi Redmi Note 9 (128GB/6GB)

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Side by side comparison between Sony Xperia U vs Xiaomi Redmi Note 9 phones, differences, pros, cons and full specifications. What's the better?

8/4/2020 2:46 PM, updated: 1/19/2023 2:42 AM

Compare Xiaomi Redmi Note 9 X Sony Xperia U (ST25i) 03Points

Specifications Compare Models Pictures

3.5"
LED

480x854

5
MP

0.3mp

512MB
RAM

Dual-core

1320
mAh

(Removable)

27Points Xiaomi Redmi Note 9 (128GB/6GB) Compare Sony Xperia U X

Specifications Compare Models Pictures

6.53"
IPS

1080x2340

48
MP

13mp

6GB
RAM

Octa-core

5020
mAh

(Non removable)

What's the better phone? Xiaomi Redmi Note 9 (128GB/6GB)

The phonemore's choice is much more technical than personal. Therefore, you shouldn't only consider this. Our goal is to help you, but what's important to us may not be important to you. You decide which one is the best! Comment!

3 Advantages Sony Xperia U (ST25i)	vs	27 Advantages Xiaomi Redmi Note 9 (128GB/6GB)
+110 grams (3.85 ounces)81% Lighter	vs	199 grams (6.97 ounces)
+Li-Ion: lithium-ion (Removable)Advantage Removable battery can be replaced easily	vs	LiPo: li-ion polymer (Non removable)
+DLNAAdvantage With DLNA technology you can access and play media files on TV, tablet or DLNA compatible device.	vs	Not supported
1GHz 32bit Dual-core (45nm)	vs	+2GHz 64bit Octa-core (12nm)3 times More powerful processor, you can open your applications faster
512MB LPDDR2	vs	+6GB LPDDR4X11 times More RAM memory. Typically more responsive and better for multitasking.
8GB (4GB available)	vs	+128GB (106GB available)26 times More internal storage for applications and files
Not supported	vs	+Until 512GB microSD, microSDXCAdvantage More external storage for files using memory cards
12 millimeters (0.47 inches)	vs	+8.9 millimeters (0.35 inches)35% Thinner
TFT LED-Backlit LCD	vs	+TFT IPS LCDAdvantage TFT IPS LCD display is brighter and more vivid
480x854 pixels	vs	+1080x2340 pixels5 times Higher resolution screen
280 PPI	vs	+395 PPI41% Crisper display of text, images and videos because it has more pixels per inch (ppi)
3.5"	vs	+6.53"87% Larger screen
(back) 5MP	vs	+(quad camera) 48MP + 8MP + 2MP + 2MP11 times Higher resolution main camera
Not supported	vs	+HDR photo on both camerasAdvantage The HDR technology produced photos with more detail in dark areas
(front) 0.3MP	vs	+(front) 13MP41 times Higher resolution secondary camera to take pictures and selfies
HD (1280x720)	vs	+Full HD (1920x1080)125% More image quality for recording videos with the primary camera
(front) VGA (640x480)	vs	+(front) Full HD (1920x1080)6 times More image quality for recording videos with the secondary camera
Android 4.0.4 Ice Cream Sandwich ICS	vs	+Android 11Advantage Android 11 is newer and safer
3G HSUPA	vs	+4G LTE-AAdvantage The 4G LTE-A network is newer and faster
(3G HSUPA) 14.4 Mbps	vs	+(4G LTE-A) 300 Mbps20 times Faster for surfing the internet and download files
Not supported	vs	+Face unlockAdvantage Sensors help you use the device
Not supported	vs	+Fingerprint sensor (rear-mounted)Advantage Sensors help you use the device
Not supported	vs	+GyroscopeAdvantage Sensors help you use the device
1320 mAh	vs	+5020 mAh3 times Battery - higher amperage (mAh) allows more device usage time, but it also depends on the hardware and use
1 slot (Single-SIM)	vs	+2 slots (Dual-SIM) (dedicated slot)Advantage You can have more mobile carriers/operators on the same device.
802.11 b/g/n [wifi4]	vs	+802.11 a/b/g/n/ac [wifi5]Advantage WiFi 802.11 a/b/g/n/ac [wifi5] is newer and faster
2.1 + A2DP	vs	+5.0 + A2DP/LEAdvantage Bluetooth 5.0 + A2DP/LE is newer and faster
MicroUSB 2.0, USB OTG On-The-Go	vs	+Type-CAdvantage Reversible connector, you can stick in a USB-C cable any which way; either side is up.
HTML, XHTML, Flash player	vs	+HTML, XHTML, HTML5Advantage Better sites viewing on the internet
Not supported	vs	+Water repellent nano-coating (don't immerse)Advantage Protection against water allows you talk to your friends in the rain, for example

18 Common items in both devices

Plastic body, glass front

60Hz

16 million

LED flash

Only digital zoom

Autofocus / PDAF: phase detection autofocus

EIS: Digital stabilization

+11 specs and more in the table below

Check the comparison table below for more items that are not evaluated in comparison score above.

Highlight differences

📱 Model features
	Sony Xperia U (ST25i)	Redmi Note 9 (128GB/6GB)
Change model		Choose the model
Model	Xperia U (ST25i)	Redmi Note 9 (128GB/6GB)
Other model names	Sony Xperia U ST25, Sony Kumquat	Mi Redmi Note 9 M2003J15SC, M2003J15SS
Country or region available	(Global, International)	China, India
Brand	Sony	Xiaomi
Release date	5/7/2012, Announced: 2/1/2012	5/12/2020, Announced: 4/30/2020
Depth	12 millimeters (0.47 inches)	8.9 millimeters (0.35 inches)
Size (width x height)	54 x 112 millimeters (2.13 x 4.41 in)	77.2 x 162.3 millimeters (3.04 x 6.39 in)
Weight	110 grams (3.85 ounces)	199 grams (6.97 ounces)
Build, materials	Plastic body, glass front	Plastic body, glass front
Protection against water and others	Not supported	Water repellent nano-coating (don't immerse)
📲 Display
	Sony Xperia U (ST25i)	Redmi Note 9 (128GB/6GB)
Display type	TFT LED-Backlit LCD	TFT IPS LCD
Screen size	3.5" inches	6.53" inches
Screen-to-body ratio	~55.8% (screen-to-body ratio)	~83.5% (screen-to-body ratio)
Display resolution	480x854 pixels (16:9)	1080x2340 pixels (19.5:9)
Touchscreen	Capacitive Multitouch 4-points	Capacitive Multitouch
Pixel density (dot pitch)	280 PPI	395 PPI
Colors	16 million	16 million
Scratch-resistant glass	Scratch-resistant glass	Gorilla Glass 5
Refresh rate	60Hz	60Hz
Display features	Not supported	450nits[typ]
🤖 Operating System
	Sony Xperia U (ST25i)	Redmi Note 9 (128GB/6GB)
System version	Android 2.3.7 Gingerbread	Android 10
Firmware update	Android 4.0.4 Ice Cream Sandwich ICS	Android 11
User Interface	feature not registered	MIUI 11 / 12
⚙️ Processor
	Sony Xperia U (ST25i)	Redmi Note 9 (128GB/6GB)
Chipset	32bit: ST-Ericsson NovaThor U8500 (45nm)	64bit: MediaTek Helio G85 (12nm)
CPU	Dual-core, 1 processor: 2x 1GHz ARM Cortex-A9 (Dual-core)	Octa-core, 2 processors: 2x 2GHz ARM-Cortex-A75 (Dual-core) 6x 1.8GHz ARM-Cortex-A55 (Hexa-core)
GPU graphical controller	ARM Mali-400 MP1	ARM Mali-G52 MC2 (1GHz)
Performance (benchmark)	feature not registered	AnTuTu: 200451 (v8) Geekbench: 1292 (v5.1)
💽 Memory and storage
	Sony Xperia U (ST25i)	Redmi Note 9 (128GB/6GB)
RAM memory	512MB LPDDR2	6GB LPDDR4X
Internal storage	8GB (4GB available)	128GB (106GB available) eMMC 5.1
External storage	Not supported	Until 512GB microSD, microSDXC (dedicated slot)
📶 Mobile networks
	Sony Xperia U (ST25i)	Redmi Note 9 (128GB/6GB)
Dual-SIM	Not supported	Dual-SIM Standby - Call active on one sim card (dedicated slot)
SIM card	1 slot (Single-SIM) Standard mini-SIM (2FF)	2 slots (Dual-SIM) nano-SIM (4FF)
Maximum Download / Upload	14.4/5.76 Mbps	300/150 Mbps
Network technology	2G, 3G	2G, 3G, 4G
Frequency, bands	Expand band details Collapse details
GSM MHz band	Quad-Band 850/900/1800/1900	Quad-Band 850/900/1800/1900
Primary 2G network	GSM 850/900/1800/1900	GSM 850/900/1800/1900
Primary 3G network	UMTS 900/2100	UMTS 850/900/1700/1900/2100
Primary 4G network	Not supported	LTE Cat7 (1, 2, 3, 4, 5, 7, 8, 20, 28) TD-LTE (38, 40, 41) VoLTE
Primary 5G network	Not supported	Not supported
Primary data network	GPRS, EDGE, UMTS, HSDPA, HSUPA	GPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+, TD-LTE, LTE, LTE-A
Secondary 2G network	Not supported	GSM 850/900/1800/1900
Secondary 3G network	Not supported	UMTS 850/900/1700/1900/2100
Secondary 4G network	Not supported	LTE Cat7 (1, 2, 3, 4, 5, 7, 8, 20, 28) TD-LTE (38, 40, 41) VoLTE
Secondary data network	Not supported	GPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+, TD-LTE, LTE, LTE-A
📷 Camera
	Sony Xperia U (ST25i)	Redmi Note 9 (128GB/6GB)
Back camera (main camera)	5 megapixels	(quad camera) 48 megapixels 8MP ultrawide f/2.213mm1/4"1.12µm118° 2MP macro f/2.41.75µmAF 2MP depth f/2.41/5"1.7µm
Main camera resolution	2592x1944 pixels	8000x6000 pixels
Video recording (primary)	HD (1280x720) 30 fps	Full HD (1920x1080) 30 fps
Flash	LED flash	LED flash
Focal aperture	feature not registered	f/1.8 (aperture)
Focal length	feature not registered	26mm lens
Sensor size	feature not registered	1/2" inches
Pixel size	feature not registered	0.8µm pixel
Autofocus	Autofocus	PDAF: phase detection autofocus
Touch focus	Supported	Supported
Image stabilization	EIS: Digital stabilization	EIS: Digital stabilization
Zoom	Only digital zoom	Only digital zoom
Face/smile detection	Face detection, Smile detection	Face detection, Smile detection
BSI sensor	Not supported	Supported
HDR	Not supported	HDR photo on both cameras
Camera extras	feature not registered	feature not registered
📸 Front camera
	Sony Xperia U (ST25i)	Redmi Note 9 (128GB/6GB)
Front camera (secondary)	0.3 megapixels	13 megapixels
Front camera resolution	640x480 pixels	4128x3096 pixels
Video recording (secondary)	VGA (640x480)	Full HD (1920x1080)
Front flash	Not supported	Not supported
Focal aperture	feature not registered	f/2.3 (aperture)
Focal length	feature not registered	29mm lens
Sensor size	feature not registered	1/3.06" inches
Pixel size	feature not registered	1.12µm pixel
🔉 Sound and multimedia
	Sony Xperia U (ST25i)	Redmi Note 9 (128GB/6GB)
Loudspeaker	Supported	Mono sound (not stereo)
Active noise cancellation	2 microphones or more	2 microphones or more
Radio	FM (RDS)	FM
TV	Not supported	Not supported
Video formats	MP4, H.263, H.264, WMV	MP4, H.265, H.264, H.263, XviD, MKV
Audio formats	MP3, eAAC+, WMA, WAV	MP3, WAV, WMA, eAAC+, FLAC
🔌 Connectivity
	Sony Xperia U (ST25i)	Redmi Note 9 (128GB/6GB)
USB	MicroUSB 2.0, USB OTG On-The-Go	USB 2.0 Type-C, USB OTG On-The-Go
Audio output	3.5mm jack	3.5mm jack
TV output	Not supported	USB Type-C (reversible)
Bluetooth	2.1 + A2DP	5.0 + A2DP/LE
WiFi	802.11 b/g/n [wifi4] (2.4GHz)	802.11 a/b/g/n/ac [wifi5] (2.4GHz, 5GHz) + MIMO WiFi Direct, hotspot
DLNA	Supported	Not supported
GPS	A-GPS, GeoTagging	A-GPS, GeoTagging, GLONASS, GALILEO, BeiDou
NFC	Not supported	Not supported
Infrared port	Not supported	Supported
🧭 Sensors
	Sony Xperia U (ST25i)	Redmi Note 9 (128GB/6GB)
Sensors	Accelerometer Ambient light sensor Compass Proximity sensor	Accelerometer Ambient light sensor Compass Face unlock Fingerprint sensor (rear-mounted) Gyroscope Proximity sensor
Vibrating alert	Supported	Supported
🔋 Battery
	Sony Xperia U (ST25i)	Redmi Note 9 (128GB/6GB)
Battery type	Li-Ion: lithium-ion (Removable) BA600	LiPo: li-ion polymer (Non removable)
Battery capacity	1320 mAh	5020 mAh
Charger, watts	Wired charging	18W Wired fast charging 9W Reverse charging by cable
Inductive / wireless charging	Not supported	Not supported
Talk time autonomy	5.6 hours	33 hours (1.4 days)
Standby	472 hours (19.7 days)	feature not registered
➕ Other features
	Sony Xperia U (ST25i)	Redmi Note 9 (128GB/6GB)
Call control	Voice dialing, Voice recorder, Voice commands	Voice dialing, Voice recorder, Voice commands
Messaging	SMS (T9), MMS, E-mail, Push mail	SMS (T9), MMS, E-mail, Push mail
Hands-free calling	Supported	Supported
Video calling	Supported	Supported
Ringtones	Polyphonic and customized	Polyphonic and customized
Web browser	HTML, XHTML, Flash player	HTML, XHTML, HTML5
Antenna	Internal antenna	Internal antenna
Qwerty physical keyboard	Not supported	Not supported
Miscellaneous	• Colors: Black, White • Exchangeable bottom caps: White, Black, Pink, Yellow • Sony Reality Display • Sony Mobile BRAVIA Engine • xLoud • 3D surround sound • WiFi hotspot • Java framework	• Colors: Forest Green, Midnight Grey, Polar White • 22.5W charger (18W phone support)
☢️ Radiation rate
	Sony Xperia U (ST25i)	Redmi Note 9 (128GB/6GB)
SAR 1.6W/kg (USA, Mexico, etc.)	1.09W/kg (head), 0.93W/kg (body)	0.84W/kg (head), 0.9W/kg (body)
SAR 2W/kg (Europe, UK, etc.)	1.62W/kg (head)	0.8W/kg (head), 1.14W/kg (body)