T-Mobile Sidekick 4G (SGH-T839) vs Xiaomi Redmi Note 12S (NFC 128GB)

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Side by side comparison between T-Mobile Sidekick 4G vs Xiaomi Redmi Note 12S phones, differences, pros, cons and full specifications. What's the better?

6/23/2023 6:37 PM, updated: 6/23/2023 6:42 PM

Compare Xiaomi Redmi Note 12S X T-Mobile Sidekick 4G (SGH-T839) 02Points

Specifications Compare Models Pictures

3.5"
TFT

480x800

3.1
MP

0.3mp

512MB
RAM

Single-core

1500
mAh

(Removable)

27Points Xiaomi Redmi Note 12S (NFC 128GB) Compare T-Mobile Sidekick 4G X

Specifications Compare Models Pictures

6.43"
AMOLED

1080x2400

108
MP

16mp

6GB
RAM

Octa-core

5000
mAh

(Non removable)

What's the better phone? Xiaomi Redmi Note 12S (NFC 128GB)

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!

2 Advantages T-Mobile Sidekick 4G (SGH-T839)	vs	27 Advantages Xiaomi Redmi Note 12S (NFC 128GB)
+162 grams (5.67 ounces)9% Lighter	vs	176 grams (6.16 ounces)
+Li-Ion: lithium-ion (Removable)Advantage Removable battery can be replaced easily	vs	LiPo: li-ion polymer (Non removable)
1GHz 32bit Single-core	vs	+2.05GHz 64bit Octa-core (12nm)4 times More powerful processor, you can open your applications faster
512MB	vs	+6GB LPDDR4X11 times More RAM memory. Typically more responsive and better for multitasking.
1GB (350MB available)	vs	+128GB (101GB available)294 times More internal storage for applications and files
Until 32GB microSD, microSDHC	vs	+Until 1TB microSD, microSDXC31 times More external storage for files using memory cards
15 millimeters (0.59 inches)	vs	+8 millimeters (0.31 inches)88% Thinner
TFT LCD	vs	+AMOLEDAdvantage AMOLED display is brighter and more vivid
480x800 pixels	vs	+1080x2400 pixels6 times Higher resolution screen
267 PPI	vs	+409 PPI53% Crisper display of text, images and videos because it has more pixels per inch (ppi)
3.5"	vs	+6.43"84% Larger screen
(back) 3.1MP	vs	+(triple camera) 108MP + 8MP + 2MP37 times Higher resolution main camera
Not supported	vs	+LED flashAdvantage The LED flash helps in dark places or in low light
(front) 0.3MP	vs	+(front) 16MP51 times Higher resolution secondary camera to take pictures and selfies
VGA (720x480)	vs	+Full HD (1920x1080)5 times More image quality for recording videos with the primary camera
Android 2.2.1 Froyo	vs	+Android 13Advantage Android 13 is newer and safer
3G+ HSPA+	vs	+4G LTE-AAdvantage The 4G LTE-A network is newer and faster
(3G+ HSPA+) 21 Mbps	vs	+(4G LTE-A) 400 Mbps18 times Faster for surfing the internet and download files
Not supported	vs	+CompassAdvantage Sensors help you use the device
Not supported	vs	+Face unlockAdvantage Sensors help you use the device
Not supported	vs	+Fingerprint sensor (side-mounted)Advantage Sensors help you use the device
Not supported	vs	+GyroscopeAdvantage Sensors help you use the device
1500 mAh	vs	+5000 mAh2 times Battery - higher amperage (mAh) allows more device usage time, but it also depends on the hardware and use
1 slot (Single-SIM) (dedicated slot)	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
3.0 + A2DP	vs	+5.2 + A2DP/LEAdvantage Bluetooth 5.2 + A2DP/LE is newer and faster
Not supported	vs	+NFCAdvantage NFC allows you to make payments by approach quickly and securely
MicroUSB 2.0	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

11 Common items in both devices

16 million

Only digital zoom

Autofocus / PDAF: phase detection autofocus

Capacitive

Multitouch

Accelerometer

Ambient light sensor

+4 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
	T-Mobile Sidekick 4G (SGH-T839)	Redmi Note 12S (NFC 128GB)
Change model		Choose the model
Model	Sidekick 4G (SGH-T839)	Redmi Note 12S (NFC 128GB)
Other model names	T-Mobile Sidekick 4G T839, Samsung SGH-T839 Sidekick 4G	Redmi Note 12S (NFC)
Country or region available	USA	(Europe), Hong Kong, Taiwan
Brand	T-Mobile	Xiaomi
Release date	4/20/2011	4/26/2023, Announced: 3/6/2023
Depth	15 millimeters (0.59 inches)	8 millimeters (0.31 inches)
Size (width x height)	61 x 127 millimeters (2.4 x 5 in)	73.87 x 159.87 millimeters (2.91 x 6.29 in)
Weight	162 grams (5.67 ounces)	176 grams (6.16 ounces)
Build, materials	feature not registered	Plastic body, glass front
Protection against water and others	Not supported	Not supported
📲 Display
	T-Mobile Sidekick 4G (SGH-T839)	Redmi Note 12S (NFC 128GB)
Display type	TFT LCD	AMOLED
Screen size	3.5" inches	6.43" inches
Screen-to-body ratio	~45% (screen-to-body ratio)	~84.5% (screen-to-body ratio)
Display resolution	480x800 pixels	1080x2400 pixels (20:9)
Touchscreen	Capacitive Multitouch	Capacitive Multitouch 10-points
Pixel density (dot pitch)	267 PPI	409 PPI
Colors	16 million	16 million
Scratch-resistant glass	Not supported	Not supported
Refresh rate	feature not registered	90Hz
Display features	feature not registered	1000nits[peak]
🤖 Operating System
	T-Mobile Sidekick 4G (SGH-T839)	Redmi Note 12S (NFC 128GB)
System version	Android 2.2.1 Froyo	Android 13
Firmware update	feature not registered	feature not registered
User Interface	feature not registered	MIUI 14
⚙️ Processor
	T-Mobile Sidekick 4G (SGH-T839)	Redmi Note 12S (NFC 128GB)
Chipset	32bit: Samsung Exynos 3	64bit: MediaTek Helio G96 (12nm)
CPU	Single-core, 1 processor: 1x 1GHz ARM Cortex-A8 (Single-core)	Octa-core, 2 processors: 2x 2.05GHz ARM Cortex-A76 (Dual-core) 6x 2GHz ARM Cortex-A55 (Hexa-core)
GPU graphical controller	PowerVR SGX540	ARM Mali-G57 MC2 (850MHz)
Performance (benchmark)	feature not registered	AnTuTu: 364204 (v9)
💽 Memory and storage
	T-Mobile Sidekick 4G (SGH-T839)	Redmi Note 12S (NFC 128GB)
RAM memory	512MB	6GB LPDDR4X
Internal storage	1GB (350MB available)	128GB (101GB available) UFS 2.2
External storage	Until 32GB microSD, microSDHC (dedicated slot)	Until 1TB microSD, microSDXC (dedicated slot)
📶 Mobile networks
	T-Mobile Sidekick 4G (SGH-T839)	Redmi Note 12S (NFC 128GB)
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	21/5.76 Mbps	400/150 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 1700/2100	UMTS 850/900/2100
Primary 4G network	Not supported	LTE Cat13 (1, 3, 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, HSPA+	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 850/900/2100
Secondary 4G network	Not supported	LTE Cat13 (1, 3, 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
	T-Mobile Sidekick 4G (SGH-T839)	Redmi Note 12S (NFC 128GB)
Back camera (main camera)	3.1 megapixels	(triple camera) 108 megapixels 8MP ultrawide f/2.2118°1/4"1.12µm 2MP macro f/2.4
Main camera resolution	2048x1536 pixels	12000x9000 pixels
Video recording (primary)	VGA (720x480) 30 fps	Full HD (1920x1080) 30 fps
Flash	Not supported	LED flash
Focal aperture	feature not registered	f/1.9 (aperture)
Focal length	feature not registered	feature not registered
Sensor size	feature not registered	1/1.52" inches
Pixel size	feature not registered	0.7µm pixel
Autofocus	Autofocus	PDAF: phase detection autofocus
Touch focus	feature not registered	Supported
Image stabilization	feature not registered	EIS: Digital stabilization
Zoom	Only digital zoom	Only digital zoom
Face/smile detection	feature not registered	Face detection, Smile detection
BSI sensor	feature not registered	Supported
HDR	feature not registered	HDR photo on both cameras
Camera extras	feature not registered	feature not registered
📸 Front camera
	T-Mobile Sidekick 4G (SGH-T839)	Redmi Note 12S (NFC 128GB)
Front camera (secondary)	0.3 megapixels	16 megapixels
Front camera resolution	640x480 pixels	4608x3456 pixels
Video recording (secondary)	Not supported	Full HD (1920x1080)
Front flash	Not supported	Not supported
Focal aperture	feature not registered	f/2.4 (aperture)
Focal length	feature not registered	feature not registered
Sensor size	feature not registered	1/3.1" inches
Pixel size	feature not registered	feature not registered
🔉 Sound and multimedia
	T-Mobile Sidekick 4G (SGH-T839)	Redmi Note 12S (NFC 128GB)
Loudspeaker	Supported	Stereo sound with dual speakers
Active noise cancellation	feature not registered	2 microphones or more
Radio	Not supported	Not supported
TV	Not supported	Not supported
Video formats	MP4, H.264, H.263	MP4, H.265, H.264, H.263, XviD, MKV
Audio formats	MP3, WAV, eAAC+	MP3, WAV, WMA, eAAC+, FLAC
🔌 Connectivity
	T-Mobile Sidekick 4G (SGH-T839)	Redmi Note 12S (NFC 128GB)
USB	MicroUSB 2.0	USB 2.0 Type-C reversible connector
Audio output	3.5mm jack	3.5mm jack
TV output	Not supported	Not supported
Bluetooth	3.0 + A2DP	5.2 + 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	feature not registered	Not supported
GPS	A-GPS, GeoTagging	A-GPS, GeoTagging, GLONASS, GALILEO, BeiDou
NFC	Not supported	Supported
Infrared port	feature not registered	Supported
🧭 Sensors
	T-Mobile Sidekick 4G (SGH-T839)	Redmi Note 12S (NFC 128GB)
Sensors	Accelerometer Ambient light sensor Proximity sensor	Accelerometer Ambient light sensor Compass Face unlock Fingerprint sensor (side-mounted) Gyroscope Proximity sensor
Vibrating alert	Supported	Supported
🔋 Battery
	T-Mobile Sidekick 4G (SGH-T839)	Redmi Note 12S (NFC 128GB)
Battery type	Li-Ion: lithium-ion (Removable)	LiPo: li-ion polymer (Non removable)
Battery capacity	1500 mAh	5000 mAh
Charger, watts	Wired charging	33W Wired fast charging
Inductive / wireless charging	feature not registered	Not supported
Talk time autonomy	6.5 hours	feature not registered
Standby	456 hours (19 days)	feature not registered
➕ Other features
	T-Mobile Sidekick 4G (SGH-T839)	Redmi Note 12S (NFC 128GB)
Call control	Voice recorder	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	Retractable QWERTY keyboard	Not supported
Miscellaneous	• Colors: Matte black, Pearl magenta • 2GB microSD included • Samsung TouchWiz UI • Optical trackpad • HAC M3/T3 • T-Mobile TV • DLNA • WiFi hotspot • Java framework	• Colors: Onyx Black, Ice Blue, Pearl Green
☢️ Radiation rate
	T-Mobile Sidekick 4G (SGH-T839)	Redmi Note 12S (NFC 128GB)
SAR 1.6W/kg (USA, Mexico, etc.)	feature not registered	feature not registered
SAR 2W/kg (Europe, UK, etc.)	feature not registered	feature not registered