Xiaomi Poco X4 GT (256GB) vs T-Mobile Sidekick 4G (SGH-T839)
Side by side comparison between Xiaomi Poco X4 GT vs T-Mobile Sidekick 4G phones, differences, pros, cons and full specifications. What's the better?
,
6.6"
IPS
IPS
1080x0
64
MP
MP
16mp
8GB
RAM
RAM
Octa-core
5080
mAh
mAh
(Non removable)
vs
3.5"
TFT
TFT
480x800
3.1
MP
MP
0.3mp
512MB
RAM
RAM
Single-core
1500
mAh
mAh
(Removable)
What's the better phone? Xiaomi Poco X4 GT (256GB)
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!
25 Advantages 
5 Advantages | 14 Common items in both devices |
| 16 million |
| Only digital zoom |
| PDAF: phase detection autofocus / Autofocus |
| Capacitive |
| Multitouch |
| Accelerometer |
| Ambient light sensor |
| +7 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 | ||
| Xiaomi Poco X4 GT (256GB) | T-Mobile Sidekick 4G (SGH-T839) | |
| Model | Poco X4 GT (256GB) | Sidekick 4G (SGH-T839) |
| Other model names | POCO X4 GT 5G (8GB RAM) | T-Mobile Sidekick 4G T839, Samsung SGH-T839 Sidekick 4G |
| Country or region available |  (Global, International) |  USA |
| Brand | Xiaomi | T-Mobile |
| Release date | 6/27/2022, Announced: 6/23/2022 | 4/20/2011 |
| Depth | 8.9 millimeters (0.35 inches) | 15 millimeters (0.59 inches) |
| Size (width x height) | 74.29 x 163.64 millimeters (2.92 x 6.44 in) | 61 x 127 millimeters (2.4 x 5 in) |
| Weight | 200 grams (7 ounces) | 162 grams (5.67 ounces) |
| Build, materials | Plastic body, glass front | feature not registered |
| Protection against water and others | Not supported | Not supported |
📲 Display | ||
| Xiaomi Poco X4 GT (256GB) | T-Mobile Sidekick 4G (SGH-T839) | |
| Display type | TFT IPS LCD | TFT LCD |
| Screen size | 6.6" inches | 3.5" inches |
| Screen-to-body ratio | feature not registered | ~45% (screen-to-body ratio) |
| Display resolution | Not supported (20.5:9) | 480x800 pixels |
| Touchscreen | Capacitive Multitouch | Capacitive Multitouch |
| Pixel density (dot pitch) | feature not registered | 267 PPI |
| Colors | 16 million | 16 million |
| Scratch-resistant glass | Gorilla Glass 5 | Not supported |
| Refresh rate | 144Hz | feature not registered |
| Display features | 500nits[typ] Dolby Vision/HDR10 DCI-P3 | feature not registered |
🤖 Operating System | ||
| Xiaomi Poco X4 GT (256GB) | T-Mobile Sidekick 4G (SGH-T839) | |
| System version | Android 12 | Android 2.2.1 Froyo |
| Firmware update | feature not registered | feature not registered |
| User Interface | MIUI 13 | feature not registered |
⚙️ Processor | ||
| Xiaomi Poco X4 GT (256GB) | T-Mobile Sidekick 4G (SGH-T839) | |
| Chipset | 64bit: MediaTek Dimensity 8100 (5nm) | 32bit: Samsung Exynos 3 |
| CPU | Octa-core, 2 processors: 4x 2.85GHz ARM Cortex-A78 (Quad-core) 4x 2GHz ARM Cortex-A55 (Quad-core) | Single-core, 1 processor: 1x 1GHz ARM Cortex-A8 (Single-core) |
| GPU graphical controller | ARM Mali-G610 MC6 | PowerVR SGX540 |
| Performance (benchmark) | feature not registered | feature not registered |
💽 Memory and storage | ||
| Xiaomi Poco X4 GT (256GB) | T-Mobile Sidekick 4G (SGH-T839) | |
| RAM memory | 8GB LPDDR5 | 512MB |
| Internal storage | 256GB (218GB available) UFS 3.1 | 1GB (350MB available) |
| External storage | Not supported | Until 32GB microSD, microSDHC (dedicated slot) |
📶 Mobile networks | ||
| Xiaomi Poco X4 GT (256GB) | T-Mobile Sidekick 4G (SGH-T839) | |
| Dual-SIM | Dual-SIM Standby - Call active on one sim card | Not supported |
| SIM card | 2 slots (Dual-SIM) nano-SIM (4FF) | 1 slot (Single-SIM) Standard mini-SIM (2FF) |
| Maximum Download / Upload | 2000/1024 Mbps | 21/5.76 Mbps |
| Network technology | 2G, 3G, 4G, 5G | 2G, 3G |
| 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 850/900/1700/1900/2100 | UMTS 1700/2100 |
| Primary 4G network | LTE Cat13 (1, 2, 3, 4, 5, 7, 8, 20, 28, 38, 40, 41) TD-LTE (38, 40, 41) VoLTE | Not supported |
| Primary 5G network | Global version: SA/NSA (1, 3, 5, 7, 8, 20, 28, 38, 40, 41, 77, 78) India version: SA/NSA (1, 3, 5, 8, 28, 38, 40, 41, 77, 78) | Not supported |
| Primary data network | GPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+, TD-LTE, LTE, LTE-A, SA/NSA | GPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+ |
| Secondary 2G network | GSM 850/900/1800/1900 | Not supported |
| Secondary 3G network | UMTS 850/900/1700/1900/2100 | Not supported |
| Secondary 4G network | LTE Cat13 (1, 2, 3, 4, 5, 7, 8, 20, 28, 38, 40, 41) TD-LTE (38, 40, 41) VoLTE | Not supported |
| Secondary data network | GPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+, TD-LTE, LTE, LTE-A, SA/NSA | Not supported |
📷 Camera | ||
| Xiaomi Poco X4 GT (256GB) | T-Mobile Sidekick 4G (SGH-T839) | |
| Back camera (main camera) | (triple camera) 64 megapixels 8MP ultrawide f/2.2120°1/4"1.12µm 2MP macro f/2.41.75µm | 3.1 megapixels |
| Main camera resolution | 10120x6328 pixels | 2048x1536 pixels |
| Video recording (primary) | 4K UHD (3840x2160) 30 fps | VGA (720x480) 30 fps |
| Flash | LED flash | Not supported |
| Focal aperture | f/1.9 (aperture) | feature not registered |
| Focal length | feature not registered | feature not registered |
| Sensor size | 1/1.72" inches | feature not registered |
| Pixel size | 0.8µm pixel | feature not registered |
| Autofocus | PDAF: phase detection autofocus | Autofocus |
| Touch focus | Supported | feature not registered |
| Image stabilization | EIS: Digital stabilization | feature not registered |
| Zoom | Only digital zoom | Only digital zoom |
| Face/smile detection | Face detection, Smile detection | feature not registered |
| BSI sensor | Supported | feature not registered |
| HDR | HDR photo on both cameras | feature not registered |
| Camera extras | 1080p@60fps | feature not registered |
📸 Front camera | ||
| Xiaomi Poco X4 GT (256GB) | T-Mobile Sidekick 4G (SGH-T839) | |
| Front camera (secondary) | 16 megapixels | 0.3 megapixels |
| Front camera resolution | 4608x3456 pixels | 640x480 pixels |
| Video recording (secondary) | Full HD (1920x1080) | Not supported |
| Front flash | Not supported | Not supported |
| Focal aperture | f/2.5 (aperture) | feature not registered |
| Focal length | feature not registered | feature not registered |
| Sensor size | 1/3.06" inches | feature not registered |
| Pixel size | 1µm pixel | feature not registered |
🔉 Sound and multimedia | ||
| Xiaomi Poco X4 GT (256GB) | T-Mobile Sidekick 4G (SGH-T839) | |
| Loudspeaker | Stereo sound with dual speakers 24-bit/192kHz Dolby Atmos | Supported |
| Active noise cancellation | 2 microphones or more | feature not registered |
| Radio | Not supported | Not supported |
| TV | Not supported | Not supported |
| Video formats | MP4, H.265, H.264, H.263, XviD, MKV | MP4, H.264, H.263 |
| Audio formats | MP3, WAV, WMA, eAAC+, FLAC | MP3, WAV, eAAC+ |
🔌 Connectivity | ||
| Xiaomi Poco X4 GT (256GB) | T-Mobile Sidekick 4G (SGH-T839) | |
| USB | USB 2.0 Type-C, USB OTG On-The-Go | MicroUSB 2.0 |
| Audio output | 3.5mm jack | 3.5mm jack |
| TV output | USB Type-C (reversible) | Not supported |
| Bluetooth | 5.3 + A2DP/LE | 3.0 + A2DP |
| WiFi | 802.11 a/b/g/n/ac/ax [wifi6] (2.4GHz, 5GHz) + MIMO WiFi Direct, hotspot | 802.11 b/g/n [wifi4] (2.4GHz) |
| DLNA | Not supported | feature not registered |
| GPS | A-GPS, GeoTagging, GLONASS, GALILEO, BeiDou, QZSS | A-GPS, GeoTagging |
| NFC | Supported | Not supported |
| Infrared port | Supported | feature not registered |
🧭 Sensors | ||
| Xiaomi Poco X4 GT (256GB) | T-Mobile Sidekick 4G (SGH-T839) | |
| Sensors | Accelerometer Ambient light sensor Compass Face unlock 2D Fingerprint sensor (side-mounted) Gyroscope Proximity sensor | Accelerometer Ambient light sensor Proximity sensor |
| Vibrating alert | Supported | Supported |
🔋 Battery | ||
| Xiaomi Poco X4 GT (256GB) | T-Mobile Sidekick 4G (SGH-T839) | |
| Battery type | LiPo: li-ion polymer (Non removable) | Li-Ion: lithium-ion (Removable) |
| Battery capacity | 5080 mAh | 1500 mAh |
| Charger, watts | 67W Wired fast charging Reverse charging by cable USB Power Delivery 3.0 | Wired charging |
| Inductive / wireless charging | Not supported | feature not registered |
| Talk time autonomy | feature not registered | 6.5 hours |
| Standby | feature not registered | 456 hours (19 days) |
➕ Other features | ||
| Xiaomi Poco X4 GT (256GB) | T-Mobile Sidekick 4G (SGH-T839) | |
| Call control | Voice dialing, Voice recorder, Voice commands | Voice recorder |
| 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, HTML5 | HTML, XHTML, Flash player |
| Antenna | Internal antenna | Internal antenna |
| Qwerty physical keyboard | Not supported | Retractable QWERTY keyboard |
| Miscellaneous | • Colors: Black, Blue, Silver • LiquidCool Technology 2.0 | • Colors: Matte black, Pearl magenta • 2GB microSD included • Samsung TouchWiz UI • Optical trackpad • HAC M3/T3 • T-Mobile TV • DLNA • WiFi hotspot • Java framework |
☢️ Radiation rate | ||
| Xiaomi Poco X4 GT (256GB) | T-Mobile Sidekick 4G (SGH-T839) | |
| 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 |