Screen size
Icon HD X551Winner: 5.5"+9.1%
Icon S5105.0"
Quick verdict
Icon HD X551 leads the measured specs 10-1.
Measured wins
Icon HD X551
10
spec wins
Overall winner
Ties
7
equal specs
Icon S510
1
spec wins
Screen size
Technology
Icon HD X551
GSM / HSPA
Icon S510
GSM / HSPA
2G bands
Icon HD X551
GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2
Icon S510
GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2
3G bands
Icon HD X551
HSDPA 850 / 1900 / 2100
Icon S510
HSDPA 850 / 1700(AWS) / 1900 - S510A, HSDPA 850 / 1900 / 2100 - X510B
Speed
Icon HD X551
HSPA 21.1/5.76 Mbps
Resolution
Refresh rate
Peak brightness
Pixel density
CPU speed
RAM
Storage
Main camera
Front camera
Battery
Wired charging
Weight
equal specsThickness
IP rating
Wi‑Fi
Bluetooth
equal specsUSB
equal specs5G support
equal specsNFC
equal specs3.5mm jack
equal specsSD card
equal specsStereo speakers
Icon S510
HSPA 21.1/5.76 Mbps
Announced
Icon HD X551
2015, November. Released 2016, January
Icon S510
2015, May. Released 2015, October
Status
Icon HD X551
Discontinued
Icon S510
Discontinued
Dimensions
Icon HD X551
153.2 x 79 x 8.2 mm (6.03 x 3.11 x 0.32 in)
Icon S510
142 x 70.5 x 8.5 mm (5.59 x 2.78 x 0.33 in)
Weight
Icon HD X551
115 g (4.06 oz)
Icon S510
115.2 g (4.06 oz)
SIM
Icon HD X551
Dual SIM (Micro-SIM/ Mini-SIM, dual stand-by)
Icon S510
Dual SIM (Mini-SIM, dual stand-by)
Type
Icon HD X551
IPS LCD
Icon S510
IPS LCD
Size
Icon HD X551
5.5 inches, 83.4 cm2 (~68.9% screen-to-body ratio)
Icon S510
5.0 inches, 68.9 cm2 (~68.8% screen-to-body ratio)
Resolution
Icon HD X551
720 x 1280 pixels, 16:9 ratio (~267 ppi density)
Icon S510
480 x 854 pixels, 16:9 ratio (~196 ppi density)
OS
Icon HD X551
Android 5.1 (Lollipop)
Icon S510
Android 4.4.2 (KitKat)
Chipset
Icon HD X551
Mediatek MT6580A (28 nm)
Icon S510
Mediatek MT6572M (28 nm)
CPU
Icon HD X551
Quad-core 1.3 GHz Cortex-A7
Icon S510
Dual-core 1.0 GHz Cortex-A7
GPU
Icon HD X551
Mali-400MP2
Icon S510
Mali-400
Card slot
Icon HD X551
microSDHC
Icon S510
microSDHC
Internal
Icon HD X551
16GB 1GB RAM
Icon S510
4GB 512MB RAM
Single
Icon HD X551
8 MP, AF
Icon S510
5 MP
Features
Icon HD X551
LED flash, HDR, panorama
Icon S510
LED flash, panorama, HDR
Video
Icon HD X551
1080p@30fps
Icon S510
1080p@30fps
Single
Icon HD X551
2 MP
Icon S510
VGA
Video
Icon HD X551
Icon S510
Loudspeaker
Icon HD X551
Yes
Icon S510
Yes, with stereo speakers
3.5mm jack
Icon HD X551
Yes
Icon S510
Yes
WLAN
Icon HD X551
Wi-Fi 802.11 b/g/n, Wi-Fi Direct, DLNA, hotspot
Icon S510
Wi-Fi 802.11 b/g/n, Wi-Fi Direct, DLNA, hotspot
Bluetooth
Icon HD X551
4.0, A2DP, EDR
Icon S510
4.0, A2DP, EDR
Positioning
Icon HD X551
GPS
Icon S510
GPS
NFC
Icon HD X551
No
Icon S510
No
Radio
Icon HD X551
FM radio
Icon S510
FM radio
USB
Icon HD X551
microUSB 2.0
Icon S510
microUSB 2.0
Sensors
Icon HD X551
Accelerometer, proximity, compass
Icon S510
Accelerometer
Type
Icon HD X551
Li-Po 2100 mAh, removable
Icon S510
Li-Po 1800 mAh battery
Stand-by
Icon HD X551
Up to 700 h (2G) / Up to 250 h (3G)
Icon S510
Up to 260 h (2G) / Up to 220 h (3G)
Talk time
Icon HD X551
Up to 22 h (2G) / Up to 12 h (3G)
Icon S510
Up to 5 h 30 min (2G) / Up to 5 h (3G)
Colors
Icon HD X551
Dark Grey, White, Gold, Rose Gold, Silver
Icon S510
Gold, White, Black