Screen size
equal specsS314.7"
S404.7"
Quick verdict
S31 leads the measured specs 5-3.
Measured wins
S31
5
spec wins
Overall winner
Ties
10
equal specs
S40
3
spec wins
Screen size
equal specsTechnology
S31
GSM / HSPA / LTE
S40
GSM / HSPA / LTE
2G bands
S31
GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 (dual-SIM model only)
S40
GSM 850 / 900 / 1800 / 1900
3G bands
S31
HSDPA 850 / 900 / 1900 / 2100 - EU, HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100 - USA
S40
HSDPA 850 / 900 / 2100 - Global, HSDPA 850 / 1700(AWS) / 1900 - North America
4G bands
S31
1, 2, 3, 5, 7, 8, 20 - EU, 2, 3, 4, 5, 7, 12, 17 - USA
Resolution
Refresh rate
Peak brightness
Pixel density
CPU speed
RAM
Storage
equal specsMain camera
equal specsFront camera
equal specsBattery
Wired charging
Weight
Thickness
IP rating
equal specsWi‑Fi
Bluetooth
equal specsUSB
equal specs5G support
equal specsNFC
3.5mm jack
equal specsSD card
equal specsStereo speakers
S40
1, 3, 7, 8, 20 - Global, 2, 4, 5, 7, 12, 17 - North America
Speed
S31
HSPA 42.2/5.76 Mbps, LTE Cat4 150/50 Mbps
S40
HSPA, LTE Cat4 150/50 Mbps
Announced
S31
2017, September. Released 2017, October
S40
2015, July. Released 2015, August
Status
S31
Discontinued
S40
Discontinued
Dimensions
S31
146 x 74.4 x 12.6 mm (5.75 x 2.93 x 0.50 in)
S40
144.9 x 74.1 x 12.5 mm (5.70 x 2.92 x 0.49 in)
Weight
S31
200 g (7.05 oz)
S40
185 g (6.53 oz)
SIM
S31
· Nano-SIM· Nano-SIM + Nano-SIM
S40
Nano-SIM
Other
S31
IP68 dust tight and water resistant (immersible up to 1.2m for 30 min) Drop resistant up to 1.8m MIL-STD-810G compliant
S40
IP68 dust tight and water resistant (immersible up to 1.5m for 30 min) Drop resistant up to 1.8m MIL-STD-810G compliant
Type
S31
TFT
S40
IPS LCD
Size
S31
4.7 inches, 60.9 cm2 (~56.1% screen-to-body ratio)
S40
4.7 inches, 60.9 cm2 (~56.7% screen-to-body ratio)
Resolution
S31
720 x 1280 pixels, 16:9 ratio (~312 ppi density)
S40
540 x 960 pixels, 16:9 ratio (~234 ppi density)
Protection
S31
Corning Gorilla Glass 3
S40
Corning Gorilla Glass 4
OS
S31
Android 7.0 (Nougat)
S40
Android 5.1 (Lollipop)
Chipset
S31
Qualcomm MSM8909 Snapdragon 210 (28 nm)
S40
Qualcomm MSM8909 Snapdragon 210 (28 nm)
CPU
S31
Quad-core 1.3 GHz Cortex-A7
S40
Quad-core 1.1 GHz Cortex-A7
GPU
S31
Adreno 304
S40
Adreno 304
Card slot
S31
microSDXC (dedicated slot)
S40
microSDXC (dedicated slot)
Internal
S31
16GB 2GB RAM
S40
16GB 1GB RAM
Other
S31
eMMC 4.5
S40
eMMC 4.5
Single
S31
8 MP, AF
S40
8 MP, AF
Features
S31
LED flash
S40
LED flash
Video
S31
720p@30fps
S40
1080p@60fps
Single
S31
2 MP
S40
2 MP
Video
S31
S40
Loudspeaker
S31
Yes
S40
Yes
3.5mm jack
S31
Yes
S40
Yes
WLAN
S31
Wi-Fi 802.11 b/g/n
S40
Wi-Fi 802.11 b/g/n, hotspot
Bluetooth
S31
4.1, A2DP, LE
S40
4.1, A2DP, LE
Positioning
S31
GPS, GLONASS, BDS
S40
GPS, GLONASS
NFC
S31
No
S40
Yes
Radio
S31
FM radio
S40
FM radio
USB
S31
microUSB 2.0, OTG
S40
microUSB 2.0, OTG
Sensors
S31
Accelerometer, proximity, compass
S40
Accelerometer, proximity, compass
Type
S31
Li-Ion 4000 mAh, non-removable
S40
Li-Ion 3000 mAh, non-removable
Stand-by
S31
-
S40
Up to 936 h
Talk time
S31
-
S40
Up to 18 h
Colors
S31
Black
S40
Black
Price
S31
About 330 EUR
S40
About 440 EUR