T-Mobile Sidekick 4G (SGH-T839) vs Xiaomi Mi Mix 2 Special (128GB/8GB)

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Side by side comparison between T-Mobile Sidekick 4G vs Xiaomi Mi Mix 2 phones, differences, pros, cons and full specifications. What's the better?

11/15/2017 9:00 PM, updated: 5/10/2020 8:29 PM

Compare Xiaomi Mi Mix 2 X T-Mobile Sidekick 4G (SGH-T839) 04Points

Specifications Compare Models Pictures

3.5"
TFT

480x800

3.1
MP

0.3mp

512MB
RAM

Single-core

1500
mAh

(Removable)

27Points Xiaomi Mi Mix 2 Special (128GB/8GB) Compare T-Mobile Sidekick 4G X

Specifications Compare Models Pictures

5.99"
IPS

1080x2160

12
MP

5mp

8GB
RAM

Octa-core

3400
mAh

(Non removable)

What's the better phone? Xiaomi Mi Mix 2 Special (128GB/8GB)

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!

4 Advantages T-Mobile Sidekick 4G (SGH-T839)	vs	27 Advantages Xiaomi Mi Mix 2 Special (128GB/8GB)
+Until 32GB microSD, microSDHCAdvantage More external storage for files using memory cards	vs	Not supported
+162 grams (5.67 ounces)15% Lighter	vs	187 grams (6.55 ounces)
+Li-Ion: lithium-ion (Removable)Advantage Removable battery can be replaced easily	vs	Li-Ion: lithium-ion (Non removable)
+3.5mm jackAdvantage Headsets with 3.5mm Jack size are more common and easy to find in stores	vs	Type-C reversible connector
1GHz 32bit Single-core	vs	+2.45GHz 64bit Octa-core (10nm)5 times More powerful processor, you can open your applications faster
512MB	vs	+8GB LPDDR4X15 times More RAM memory. Typically more responsive and better for multitasking.
1GB (350MB available)	vs	+128GB (118GB available)344 times More internal storage for applications and files
15 millimeters (0.59 inches)	vs	+7.7 millimeters (0.3 inches)95% Thinner
TFT LCD	vs	+TFT IPS LCDAdvantage TFT IPS LCD display is brighter and more vivid
480x800 pixels	vs	+1080x2160 pixels5 times Higher resolution screen
267 PPI	vs	+403 PPI51% Crisper display of text, images and videos because it has more pixels per inch (ppi)
3.5"	vs	+5.99"71% Larger screen
(back) 3.1MP	vs	+(back) 12MP3 times Higher resolution main camera
Not supported	vs	+Dual-LED flashAdvantage The Dual-LED flash helps in dark places or in low light
(front) 0.3MP	vs	+(front) 5MP15 times Higher resolution secondary camera to take pictures and selfies
VGA (720x480)	vs	+4K UHD (3840x2160)23 times More image quality for recording videos with the primary camera
Android 2.2.1 Froyo	vs	+Android 9.0 PieAdvantage Android 9.0 Pie 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) 600 Mbps28 times Faster for surfing the internet and download files
Not supported	vs	+BarometerAdvantage Sensors help you use the device
Not supported	vs	+CompassAdvantage 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
1500 mAh	vs	+3400 mAh127% 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)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	+5.0 + A2DP/LEAdvantage Bluetooth 5.0 + 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
Not supported	vs	+Gorilla Glass 4Advantage Protection against scratches on the screen lets you carry your phone with your keys

13 Common items in both devices

16 million

Only digital zoom

Autofocus / PDAF: phase detection autofocus

Capacitive

Multitouch

Accelerometer

Ambient light sensor

+6 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)	Xiaomi Mi Mix 2 Special (128GB/8GB)
Change model		Choose the model
Model	Sidekick 4G (SGH-T839)	Xiaomi Mi Mix 2 Special (128GB/8GB)
Other model names	T-Mobile Sidekick 4G T839, Samsung SGH-T839 Sidekick 4G	Xiaomi Mi Mix 2 Special edition (8GB RAM), Xiaomi Mi Mix Evo
Country or region available	USA	China, Hong Kong
Brand	T-Mobile	Xiaomi
Release date	4/20/2011	9/1/2017
Depth	15 millimeters (0.59 inches)	7.7 millimeters (0.3 inches)
Size (width x height)	61 x 127 millimeters (2.4 x 5 in)	74.6 x 150.5 millimeters (2.94 x 5.93 in)
Weight	162 grams (5.67 ounces)	187 grams (6.55 ounces)
Build, materials	feature not registered	Ceramic body, glass front
Protection against water and others	Not supported	Not supported
📲 Display
	T-Mobile Sidekick 4G (SGH-T839)	Xiaomi Mi Mix 2 Special (128GB/8GB)
Display type	TFT LCD	TFT IPS LCD
Screen size	3.5" inches	5.99" inches
Screen-to-body ratio	~45% (screen-to-body ratio)	~82.5% (screen-to-body ratio)
Display resolution	480x800 pixels	1080x2160 pixels
Touchscreen	Capacitive Multitouch	Capacitive Multitouch
Pixel density (dot pitch)	267 PPI	403 PPI
Colors	16 million	16 million
Scratch-resistant glass	Not supported	Gorilla Glass 4
Refresh rate	feature not registered	feature not registered
Display features	feature not registered	feature not registered
🤖 Operating System
	T-Mobile Sidekick 4G (SGH-T839)	Xiaomi Mi Mix 2 Special (128GB/8GB)
System version	Android 2.2.1 Froyo	Android 7.1 Nougat
Firmware update	feature not registered	Android 9.0 Pie
User Interface	feature not registered	feature not registered
⚙️ Processor
	T-Mobile Sidekick 4G (SGH-T839)	Xiaomi Mi Mix 2 Special (128GB/8GB)
Chipset	32bit: Samsung Exynos 3	64bit: Qualcomm Snapdragon 835 (MSM8998) (10nm)
CPU	Single-core, 1 processor: 1x 1GHz ARM Cortex-A8 (Single-core)	Octa-core, 2 processors: 4x 2.45GHz Kryo 280 (Quad-core) 4x 1.9GHz Kryo 280 (Quad-core)
GPU graphical controller	PowerVR SGX540	Qualcomm Adreno 540 (670-710MHz)
Performance (benchmark)	feature not registered	feature not registered
💽 Memory and storage
	T-Mobile Sidekick 4G (SGH-T839)	Xiaomi Mi Mix 2 Special (128GB/8GB)
RAM memory	512MB	8GB LPDDR4X
Internal storage	1GB (350MB available)	128GB (118GB available) eMMC 5.1
External storage	Until 32GB microSD, microSDHC (dedicated slot)	Not supported
📶 Mobile networks
	T-Mobile Sidekick 4G (SGH-T839)	Xiaomi Mi Mix 2 Special (128GB/8GB)
Dual-SIM	Not supported	Dual-SIM Standby - Call active on one sim card
SIM card	1 slot (Single-SIM) Standard mini-SIM (2FF)	2 slots (Dual-SIM) nano-SIM (4FF)
Maximum Download / Upload	21/5.76 Mbps	600/50 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	CDMA 800, GSM 850/900/1800/1900
Primary 3G network	UMTS 1700/2100	CDMA2000 1xEV-DO TD-SCDMA 1900/2000 UMTS 800/850/900/1700/1800/1900/2100
Primary 4G network	Not supported	LTE Cat12 (Bands 1, 2, 3, 4, 5, 7, 8, 12, 13, 17, 18, 19, 20, 25, 26, 27, 28, 29, 30, 34) TD-LTE (Bands 38, 39, 40, 41) VoLTE
Primary 5G network	Not supported	Not supported
Primary data network	GPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+	GPRS, EDGE, CDMA2000 EV-DO Rev 0, CDMA2000 EV-DO Rev A, TD-SCDMA, UMTS, TD-HSDPA, HSDPA, HSUPA, HSPA+, TD-LTE, LTE, LTE-A
Secondary 2G network	Not supported	GSM 850/900/1800/1900
Secondary 3G network	Not supported	Not supported
Secondary 4G network	Not supported	Not supported
Secondary data network	Not supported	GPRS, EDGE
📷 Camera
	T-Mobile Sidekick 4G (SGH-T839)	Xiaomi Mi Mix 2 Special (128GB/8GB)
Back camera (main camera)	3.1 megapixels	12 megapixels
Main camera resolution	2048x1536 pixels	4000x3000 pixels
Video recording (primary)	VGA (720x480) 30 fps	4K UHD (3840x2160) 30 fps
Flash	Not supported	Dual-LED flash
Focal aperture	feature not registered	f/2.0 (aperture)
Focal length	feature not registered	feature not registered
Sensor size	feature not registered	1/2.9" inches
Pixel size	feature not registered	1.25µm pixel
Autofocus	Autofocus	PDAF: phase detection autofocus
Touch focus	feature not registered	Supported
Image stabilization	feature not registered	OIS (4-axis): Optical stabilization
Zoom	Only digital zoom	Only digital zoom
Face/smile detection	feature not registered	Face detection, Smile detection
BSI sensor	feature not registered	Not supported
HDR	feature not registered	HDR photo only main camera
Camera extras	feature not registered	feature not registered
📸 Front camera
	T-Mobile Sidekick 4G (SGH-T839)	Xiaomi Mi Mix 2 Special (128GB/8GB)
Front camera (secondary)	0.3 megapixels	5 megapixels
Front camera resolution	640x480 pixels	2592x1944 pixels
Video recording (secondary)	Not supported	Full HD (1920x1080)
Front flash	Not supported	Not supported
Focal aperture	feature not registered	f/2.0 (aperture)
Focal length	feature not registered	feature not registered
Sensor size	feature not registered	feature not registered
Pixel size	feature not registered	feature not registered
🔉 Sound and multimedia
	T-Mobile Sidekick 4G (SGH-T839)	Xiaomi Mi Mix 2 Special (128GB/8GB)
Loudspeaker	Supported	Supported
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, MKV, XviD
Audio formats	MP3, WAV, eAAC+	MP3, WAV, OGG, eAAC+, FLAC
🔌 Connectivity
	T-Mobile Sidekick 4G (SGH-T839)	Xiaomi Mi Mix 2 Special (128GB/8GB)
USB	MicroUSB 2.0	USB 2.0 Type-C, USB OTG On-The-Go
Audio output	3.5mm jack	Type-C reversible connector
TV output	Not supported	Not supported
Bluetooth	3.0 + 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	feature not registered	Not supported
GPS	A-GPS, GeoTagging	A-GPS, GeoTagging, GLONASS, BeiDou
NFC	Not supported	Supported
Infrared port	feature not registered	Not supported
🧭 Sensors
	T-Mobile Sidekick 4G (SGH-T839)	Xiaomi Mi Mix 2 Special (128GB/8GB)
Sensors	Accelerometer Ambient light sensor Proximity sensor	Accelerometer Ambient light sensor Barometer Compass Fingerprint sensor (rear-mounted) Gyroscope Hall effect Proximity sensor
Vibrating alert	Supported	Supported
🔋 Battery
	T-Mobile Sidekick 4G (SGH-T839)	Xiaomi Mi Mix 2 Special (128GB/8GB)
Battery type	Li-Ion: lithium-ion (Removable)	Li-Ion: lithium-ion (Non removable)
Battery capacity	1500 mAh	3400 mAh
Charger, watts	Wired charging	18W (9V/2A) Wired fast charging
Inductive / wireless charging	feature not registered	feature not registered
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)	Xiaomi Mi Mix 2 Special (128GB/8GB)
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: Ceramic black, Ceramic white • MIUI 9 • Quick Charge 3.0 • Type-C to 3.5mm headphone jack adapter • 720p@120fps slow motion • Miracast
☢️ Radiation rate
	T-Mobile Sidekick 4G (SGH-T839)	Xiaomi Mi Mix 2 Special (128GB/8GB)
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