Screen size
A31 (2015)4.5"
K15xWinner: 6.8"+33%
Quick verdict
K15x leads the measured specs 16-2.
Measured wins
A31 (2015)
2
spec wins
Ties
4
equal specs
K15x
16
spec wins
Overall winner
Screen size
Technology
A31 (2015)
GSM / LTE
K15x
GSM / HSPA / LTE / 5G
2G bands
A31 (2015)
GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2
K15x
GSM 850 / 900 / 1800 / 1900
3G bands
A31 (2015)
TD-SCDMA
K15x
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
equal specsBattery
Wired charging
Weight
Thickness
IP rating
Wi‑Fi
Bluetooth
USB
equal specs5G support
NFC
3.5mm jack
equal specsSD card
equal specsStereo speakers
K15x
1, 3, 5, 8, 28, 34, 38, 39, 40, 41
Speed
A31 (2015)
TD-SCDMA, LTE Cat4 150/50 Mbps
K15x
HSPA, LTE, 5G
GPRS
A31 (2015)
Yes
K15x
-
EDGE
A31 (2015)
Yes
K15x
-
5G bands
A31 (2015)
-
K15x
1, 3, 5, 8, 28, 41, 48, 77, 78 SA/NSA
Announced
A31 (2015)
2015, April. Released 2015, April 17
K15x
2026, October 02
Status
A31 (2015)
Discontinued
K15x
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)
K15x
166.6 x 78.5 x 8.6 mm (6.56 x 3.09 x 0.34 in)
Weight
A31 (2015)
135 g (4.76 oz)
K15x
212 g (7.48 oz)
SIM
A31 (2015)
Nano-SIM + Micro-SIM
K15x
Nano-SIM + Nano-SIM
Build
A31 (2015)
-
K15x
Glass front, plastic frame, plastic back
Other
A31 (2015)
-
K15x
IP64 dust tight and water resistant (water splashes)
Type
A31 (2015)
IPS LCD
K15x
IPS LCD, 120Hz, 1125 nits (peak)
Size
A31 (2015)
4.5 inches, 55.8 cm2 (~64.6% screen-to-body ratio)
K15x
6.75 inches, 111.4 cm2 (~85.2% screen-to-body ratio)
Resolution
A31 (2015)
480 x 854 pixels, 16:9 ratio (~218 ppi density)
K15x
720 x 1570 pixels, 19.5:9 ratio (~256 ppi density)
OS
A31 (2015)
Android 4.4 (KitKat)
K15x
Android 16, ColorOS 16
Chipset
A31 (2015)
Qualcomm MSM8916 Snapdragon 410 (28 nm)
K15x
Mediatek Dimensity 6300 (6 nm)
CPU
A31 (2015)
Quad-core 1.2 GHz Cortex-A53
K15x
Octa-core (2x2.4 GHz Cortex-A76 & 6x2.0 GHz Cortex-A55)
GPU
A31 (2015)
Adreno 306
K15x
Mali-G57 MC2
Card slot
A31 (2015)
microSDXC (dedicated slot)
K15x
microSDXC
Internal
A31 (2015)
8GB 1GB RAM
K15x
128GB 6GB RAM, 256GB 6GB RAM
Other
A31 (2015)
eMMC 4.5
K15x
UFS 2.2
Single
A31 (2015)
8 MP, AF
K15x
-
Features
A31 (2015)
LED flash
K15x
LED flash, HDR, panorama
Video
A31 (2015)
1080p@30fps
K15x
1080p@30/60fps
Dual
A31 (2015)
-
K15x
13 MP, f/2.2, 27mm (wide), AF Auxiliary lens
Single
A31 (2015)
5 MP
K15x
5 MP, f/2.2, 27mm (wide)
Video
A31 (2015)
K15x
1080p@30fps
Features
A31 (2015)
-
K15x
Panorama
Loudspeaker
A31 (2015)
Yes
K15x
Yes
3.5mm jack
A31 (2015)
Yes
K15x
Yes
WLAN
A31 (2015)
Wi-Fi 802.11 b/g/n
K15x
Wi-Fi 802.11 a/b/g/n/ac, dual-band
Bluetooth
A31 (2015)
4.0, A2DP
K15x
5.4, A2DP, LE, aptX HD
Positioning
A31 (2015)
GPS
K15x
GPS, GALILEO, GLONASS, QZSS
NFC
A31 (2015)
No
K15x
Yes
Radio
A31 (2015)
No
K15x
No
USB
A31 (2015)
microUSB 2.0
K15x
USB Type-C 2.0, OTG
Sensors
A31 (2015)
Accelerometer, proximity
K15x
Fingerprint (side-mounted), accelerometer, proximity, compass
Type
A31 (2015)
Li-Ion 2000 mAh, non-removable
K15x
6500 mAh
Stand-by
A31 (2015)
Up to 240 h
K15x
-
Talk time
A31 (2015)
Up to 7 h
K15x
-
Charging
A31 (2015)
-
K15x
45W wired 5W reverse wired
Colors
A31 (2015)
White, Blue
K15x
Purple, White
Price
A31 (2015)
About 150 EUR
K15x
About 230 EUR
Models
A31 (2015)
-
K15x
PLT150