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T-Mobile Sidekick 4G (SGH-T839) vs LG K4 (VS425)

Side by side comparison between T-Mobile Sidekick 4G vs LG K4 phones, differences, pros, cons and full specifications. What's the better?

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Compare LG K4 X T-Mobile Sidekick 4G (SGH-T839) 01Point
T-Mobile Sidekick 4G (SGH-T839)
Specifications Compare Models Pictures
3.5"
TFT

480x800

3.1
MP

0.3mp

512MB
RAM

Single-core

1500
mAh

(Removable)

vs
19Points LG K4 (VS425) Compare T-Mobile Sidekick 4G X
LG K4 (VS425)
Specifications Compare Models Pictures
4.5"
IPS

480x854

5
MP

2mp

1.5GB
RAM

Quad-core

1940
mAh

(Removable)

What's the better phone? LG K4 (VS425)

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!

Sidekick 4G (SGH-T839)} 1 Advantage T-Mobile Sidekick 4G (SGH-T839) vs K4 (VS425)} 19 Advantages LG K4 (VS425)
+267 PPI22%
Crisper display of text, images and videos because it has more pixels per inch (ppi)		vs218 PPI
1GHz 32bit Single-corevs+1.1GHz 32bit Quad-core90%
More powerful processor, you can open your applications faster
512MBvs+1.5GB LPDDR32 times
More RAM memory. Typically more responsive and better for multitasking.
1GB (350MB available)vs+16GB (10GB available)28 times
More internal storage for applications and files
162 grams (5.67 ounces)vs+113 grams (3.96 ounces)43%
Lighter
15 millimeters (0.59 inches)vs+8.9 millimeters (0.35 inches)69%
Thinner
TFT LCDvs+TFT IPS LCDAdvantage
TFT IPS LCD display is brighter and more vivid
480x800 pixelsvs+480x854 pixels7%
Higher resolution screen
3.5"vs+4.5"29%
Larger screen
(back) 3.1MPvs+(back) 5MP60%
Higher resolution main camera
Not supportedvs+LED flashAdvantage
The LED flash helps in dark places or in low light
(front) 0.3MPvs+(front) 2MP5 times
Higher resolution secondary camera to take pictures and selfies
VGA (720x480)vs+HD (1280x720)167%
More image quality for recording videos with the primary camera
Android 2.2.1 Froyovs+Android 5.1.1 LollipopAdvantage
Android 5.1.1 Lollipop is newer and safer
3G+ HSPA+vs+4G LTEAdvantage
The 4G LTE network is newer and faster
(3G+ HSPA+) 21 Mbpsvs+(4G LTE) 150 Mbps6 times
Faster for surfing the internet and download files
1500 mAhvs+1940 mAh29%
Battery - higher amperage (mAh) allows more device usage time, but it also depends on the hardware and use
Not supportedvs+FM (RDS)Advantage
The radio lets you listen to your songs and sports in general
3.0 + A2DPvs+4.1 + A2DPAdvantage
Bluetooth 4.1 + A2DP is newer and faster
HTML, XHTML, Flash playervs+HTML, XHTML, HTML5Advantage
Better sites viewing on the internet
17 Common items in both devices
Until 32GB microSD, microSDHC
16 million
Only digital zoom
Autofocus
Capacitive
Multitouch
Accelerometer
+10 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 Clear highlight

📱 Model features

T-Mobile Sidekick 4G (SGH-T839)LG K4 (VS425)
Change model 
ModelSidekick 4G (SGH-T839)LG K4 (VS425)
Other model namesT-Mobile Sidekick 4G T839, Samsung SGH-T839 Sidekick 4GVerizon LG K4 LTE (16GB) VS425, LG-VS425
Country or region availableUSA
USA		USA
USA
BrandT-MobileLG
Release date4/20/20113/26/2016, Announced: 2/1/2016
Depth15 millimeters (0.59 inches)8.9 millimeters (0.35 inches)
Size (width x height)61 x 127 millimeters (2.4 x 5 in)66.7 x 131.9 millimeters (2.63 x 5.19 in)
Weight162 grams (5.67 ounces)113 grams (3.96 ounces)
Build, materialsfeature not registeredPlastic body, glass front
Protection against water and othersNot supportedNot supported

📲 Display

T-Mobile Sidekick 4G (SGH-T839)LG K4 (VS425)
Display typeTFT LCDTFT IPS LCD
Screen size3.5" inches4.5" inches
Screen-to-body ratio~45% (screen-to-body ratio)~63.4% (screen-to-body ratio)
Display resolution480x800 pixels480x854 pixels
TouchscreenCapacitive MultitouchCapacitive Multitouch
Pixel density (dot pitch)267 PPI218 PPI
Colors16 million16 million
Scratch-resistant glassNot supportedNot supported
Refresh ratefeature not registered60Hz
Display featuresfeature not registeredNot supported

🤖 Operating System

T-Mobile Sidekick 4G (SGH-T839)LG K4 (VS425)
System versionAndroid 2.2.1 FroyoAndroid 5.1.1 Lollipop
Firmware updatefeature not registeredfeature not registered
User Interfacefeature not registeredfeature not registered

⚙️ Processor

T-Mobile Sidekick 4G (SGH-T839)LG K4 (VS425)
Chipset32bit: Samsung Exynos 332bit: Qualcomm Snapdragon 210 MSM8909 (28nm)
CPUSingle-core, 1 processor:
1x 1GHz ARM Cortex-A8 (Single-core)		Quad-core, 1 processor:
4x 1.1GHz ARM Cortex-A7 (Quad-core)
GPU graphical controllerPowerVR SGX540Qualcomm Adreno 304
Performance (benchmark)feature not registeredfeature not registered

💽 Memory and storage

T-Mobile Sidekick 4G (SGH-T839)LG K4 (VS425)
RAM memory512MB1.5GB LPDDR3
Internal storage1GB (350MB available)16GB (10GB available)
External storageUntil 32GB microSD, microSDHC
(dedicated slot)		Until 32GB microSD, microSDHC
(dedicated slot)

📶 Mobile networks

T-Mobile Sidekick 4G (SGH-T839)LG K4 (VS425)
Dual-SIMNot supportedNot supported
SIM card1 slot (Single-SIM)
Standard mini-SIM (2FF)		1 slot (Single-SIM)
micro-SIM (3FF)
Maximum Download / Upload21/5.76 Mbps150/50 Mbps
Network technology2G, 3G2G, 3G, 4G
Frequency, bands Expand band details Collapse details
GSM MHz bandQuad-Band 850/900/1800/1900Quad-Band 850/900/1800/1900
Primary 2G networkGSM 850/900/1800/1900CDMA 800/1900, GSM 850/900/1800/1900
Primary 3G networkUMTS 1700/2100CDMA2000 1xEV-DO
Primary 4G networkNot supportedLTE Cat4 (Bands 2, 4, 5, 13)
Primary 5G networkNot supportedNot supported
Primary data networkGPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+GPRS, EDGE, CDMA2000 EV-DO Rev 0, CDMA2000 EV-DO Rev A, LTE
Secondary 2G networkNot supportedNot supported
Secondary 3G networkNot supportedNot supported
Secondary 4G networkNot supportedNot supported
Secondary data networkNot supportedNot supported

📷 Camera

T-Mobile Sidekick 4G (SGH-T839)LG K4 (VS425)
Back camera (main camera)3.1 megapixels5 megapixels
Main camera resolution2048x1536 pixels2592x1944 pixels
Video recording (primary)VGA (720x480) 30 fpsHD (1280x720) 30 fps
FlashNot supportedLED flash
Focal aperturefeature not registeredf/2.8 (aperture)
Focal lengthfeature not registeredfeature not registered
Sensor sizefeature not registeredfeature not registered
Pixel sizefeature not registeredfeature not registered
AutofocusAutofocusAutofocus
Touch focusfeature not registeredSupported
Image stabilizationfeature not registeredEIS: Digital stabilization
ZoomOnly digital zoomOnly digital zoom
Face/smile detectionfeature not registeredFace detection, Smile detection
BSI sensorfeature not registeredNot supported
HDRfeature not registeredNot supported
Camera extrasfeature not registeredfeature not registered

📸 Front camera

T-Mobile Sidekick 4G (SGH-T839)LG K4 (VS425)
Front camera (secondary)0.3 megapixels2 megapixels
Front camera resolution640x480 pixels1600x1200 pixels
Video recording (secondary)Not supportedHD (1280x720)
Front flashNot supportedNot supported
Focal aperturefeature not registeredf/2.8 (aperture)
Focal lengthfeature not registeredfeature not registered
Sensor sizefeature not registeredfeature not registered
Pixel sizefeature not registeredfeature not registered

🔉 Sound and multimedia

T-Mobile Sidekick 4G (SGH-T839)LG K4 (VS425)
LoudspeakerSupportedSupported
Active noise cancellationfeature not registeredNot supported
RadioNot supportedFM (RDS)
TVNot supportedNot supported
Video formatsMP4, H.264, H.263MP4, H.264, H.263, XviD
Audio formatsMP3, WAV, eAAC+MP3, WAV, eAAC+, FLAC

🔌 Connectivity

T-Mobile Sidekick 4G (SGH-T839)LG K4 (VS425)
USBMicroUSB 2.0MicroUSB 2.0
Audio output3.5mm jack3.5mm jack
TV outputNot supportedNot supported
Bluetooth3.0 + A2DP4.1 + A2DP
WiFi802.11 b/g/n [wifi4] (2.4GHz)802.11 b/g/n [wifi4] (2.4GHz)
WiFi Direct, hotspot
DLNAfeature not registeredNot supported
GPSA-GPS, GeoTaggingA-GPS, GeoTagging, GLONASS
NFCNot supportedNot supported
Infrared portfeature not registeredNot supported

🧭 Sensors

T-Mobile Sidekick 4G (SGH-T839)LG K4 (VS425)
SensorsAccelerometer
Ambient light sensor
Proximity sensor		Accelerometer
Ambient light sensor
Proximity sensor
Vibrating alertSupportedSupported

🔋 Battery

T-Mobile Sidekick 4G (SGH-T839)LG K4 (VS425)
Battery typeLi-Ion: lithium-ion (Removable)Li-Ion: lithium-ion (Removable)
BL-49JH
Battery capacity1500 mAh1940 mAh
Charger, wattsWired chargingWired charging
Inductive / wireless chargingfeature not registeredNot supported
Talk time autonomy6.5 hours10 hours
Standby456 hours (19 days)500 hours (20.8 days)

➕ Other features

T-Mobile Sidekick 4G (SGH-T839)LG K4 (VS425)
Call controlVoice recorderVoice dialing, Voice recorder
MessagingSMS (T9), MMS, E-mail, Push mailSMS (T9), MMS, E-mail, Push mail
Hands-free callingSupportedSupported
Video callingSupportedSupported
RingtonesPolyphonic and customizedPolyphonic and customized
Web browserHTML, XHTML, Flash playerHTML, XHTML, HTML5
AntennaInternal antennaInternal antenna
Qwerty physical keyboardRetractable QWERTY keyboardNot 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: Black
Knock Code

☢️ Radiation rate

T-Mobile Sidekick 4G (SGH-T839)LG K4 (VS425)
SAR 1.6W/kg (USA, Mexico, etc.)feature not registered1.22W/kg (head), 1.29W/kg (body)
SAR 2W/kg (Europe, UK, etc.)feature not registeredfeature not registered
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