Screen size
A31 (2015)4.5"
K15sWinner: 6.6"+32%
Quick verdict
K15s leads the measured specs 17-3.
Measured wins
A31 (2015)
3
spec wins
Ties
2
equal specs
K15s
17
spec wins
Overall winner
Screen size
Technology
A31 (2015)
GSM / LTE
K15s
GSM / HSPA / LTE / 5G
2G bands
A31 (2015)
GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2
K15s
GSM 850 / 900 / 1800 / 1900
3G bands
A31 (2015)
TD-SCDMA
K15s
HSDPA 850 / 900 / 2100
4G bands
A31 (2015)
38, 39, 40, 41
Resolution
Refresh rate
Peak brightness
Pixel density
CPU speed
RAM
Storage
Main camera
Front camera
Battery
Wired charging
Weight
Thickness
IP rating
Wi‑Fi
Bluetooth
USB
equal specs5G support
NFC
3.5mm jack
SD card
equal specsStereo speakers
K15s
1, 3, 5, 8, 28, 34, 38, 39, 40, 41, 42, 48
Speed
A31 (2015)
TD-SCDMA, LTE Cat4 150/50 Mbps
K15s
HSPA, LTE, 5G
GPRS
A31 (2015)
Yes
K15s
-
EDGE
A31 (2015)
Yes
K15s
-
5G bands
A31 (2015)
-
K15s
1, 3, 5, 8, 28, 38, 40, 41, 48, 77, 78 SA/NSA
Announced
A31 (2015)
2015, April. Released 2015, April 17
K15s
2026, October 02
Status
A31 (2015)
Discontinued
K15s
Available. Released 2026, October 02
Dimensions
A31 (2015)
131.9 x 65.5 x 8 mm (5.19 x 2.58 x 0.31 in)
K15s
159.1 x 75.8 x 8.8 mm (6.26 x 2.98 x 0.35 in)
Weight
A31 (2015)
135 g (4.76 oz)
K15s
205 g (7.23 oz)
SIM
A31 (2015)
Nano-SIM + Micro-SIM
K15s
Nano-SIM + Nano-SIM
Build
A31 (2015)
-
K15s
Glass front, plastic frame, plastic back
Other
A31 (2015)
-
K15s
IP68/IP69K dust tight and water resistant (high pressure water jets; immersible up to 1.5m for 30 min) Drop resistant up to 1.8m
Type
A31 (2015)
IPS LCD
K15s
AMOLED, 1B colors, 120Hz, 800 nits (typ), 1400 nits (peak)
Size
A31 (2015)
4.5 inches, 55.8 cm2 (~64.6% screen-to-body ratio)
K15s
6.57 inches, 105.0 cm2 (~87.1% screen-to-body ratio)
Resolution
A31 (2015)
480 x 854 pixels, 16:9 ratio (~218 ppi density)
K15s
1080 x 2372 pixels (~397 ppi density)
OS
A31 (2015)
Android 4.4 (KitKat)
K15s
Android 16, ColorOS 16
Chipset
A31 (2015)
Qualcomm MSM8916 Snapdragon 410 (28 nm)
K15s
Mediatek Dimensity 6360 Max (6 nm)
CPU
A31 (2015)
Quad-core 1.2 GHz Cortex-A53
K15s
Octa-core (2x2.4 GHz Cortex-A76 & 6x2.0 GHz Cortex-A55)
GPU
A31 (2015)
Adreno 306
K15s
Mali-G57 MC2
Card slot
A31 (2015)
microSDXC (dedicated slot)
K15s
microSDXC
Internal
A31 (2015)
8GB 1GB RAM
K15s
128GB 6GB RAM, 256GB 8GB RAM
Other
A31 (2015)
eMMC 4.5
K15s
UFS 2.2
Single
A31 (2015)
8 MP, AF
K15s
-
Features
A31 (2015)
LED flash
K15s
LED flash, HDR, panorama
Video
A31 (2015)
1080p@30fps
K15s
1080p@30/60fps
Dual
A31 (2015)
-
K15s
50 MP, f/1.9, 25mm (wide), PDAF Auxiliary lens
Single
A31 (2015)
5 MP
K15s
8 MP, f/2.1, 25mm (wide)
Video
A31 (2015)
K15s
1080p@30fps
Features
A31 (2015)
-
K15s
Panorama
Loudspeaker
A31 (2015)
Yes
K15s
Yes
3.5mm jack
A31 (2015)
Yes
K15s
No
WLAN
A31 (2015)
Wi-Fi 802.11 b/g/n
K15s
Wi-Fi 802.11 a/b/g/n/ac, dual-band
Bluetooth
A31 (2015)
4.0, A2DP
K15s
5.4, A2DP, LE, aptX HD
Positioning
A31 (2015)
GPS
K15s
GPS, GALILEO, GLONASS, BDS, QZSS
NFC
A31 (2015)
No
K15s
Yes
Radio
A31 (2015)
No
K15s
No
USB
A31 (2015)
microUSB 2.0
K15s
USB Type-C 2.0, OTG
Infrared port
A31 (2015)
-
K15s
Yes
Sensors
A31 (2015)
Accelerometer, proximity
K15s
Fingerprint (under display, optical), accelerometer, gyro, proximity, compass
Type
A31 (2015)
Li-Ion 2000 mAh, non-removable
K15s
Si/C Li-Ion 8000 mAh
Stand-by
A31 (2015)
Up to 240 h
K15s
-
Talk time
A31 (2015)
Up to 7 h
K15s
-
Charging
A31 (2015)
-
K15s
45W wired, 45W UFCS, 45W PPS, 13.5W PD Reverse wired
Colors
A31 (2015)
White, Blue
K15s
Gray, Purple
Price
A31 (2015)
About 150 EUR
K15s
About 270 EUR
Models
A31 (2015)
-
K15s
PYE130