Screen size
A31 (2015)4.5"
K14xWinner: 6.8"+33%
Quick verdict
K14x leads the measured specs 14-2.
Measured wins
A31 (2015)
2
spec wins
Ties
5
equal specs
K14x
14
spec wins
Overall winner
Screen size
Technology
A31 (2015)
GSM / LTE
K14x
GSM / HSPA / LTE / 5G
2G bands
A31 (2015)
GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2
K14x
GSM 850 / 900 / 1800 / 1900
3G bands
A31 (2015)
TD-SCDMA
K14x
HSDPA 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
equal specs3.5mm jack
equal specsSD card
equal specsStereo speakers
K14x
1, 3, 5, 8, 19, 28, 38, 40, 41, 42, 48
Speed
A31 (2015)
TD-SCDMA, LTE Cat4 150/50 Mbps
K14x
HSPA, LTE, 5G
GPRS
A31 (2015)
Yes
K14x
-
EDGE
A31 (2015)
Yes
K14x
-
5G bands
A31 (2015)
-
K14x
1, 3, 5, 8, 28, 38, 40, 41, 48, 77, 78 SA/NSA
Announced
A31 (2015)
2015, April. Released 2015, April 17
K14x
2026, February 10
Status
A31 (2015)
Discontinued
K14x
Released Feb 16, 2026
Dimensions
A31 (2015)
131.9 x 65.5 x 8 mm (5.19 x 2.58 x 0.31 in)
K14x
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)
K14x
212 g (7.48 oz)
SIM
A31 (2015)
Nano-SIM + Micro-SIM
K14x
Nano-SIM + Nano-SIM
Build
A31 (2015)
-
K14x
Glass front, plastic frame, plastic back
Other
A31 (2015)
-
K14x
IP64 dust tight and water resistant (water splashes)
Type
A31 (2015)
IPS LCD
K14x
IPS LCD, 120Hz, 700 nits (typ), 1125 nits (peak)
Size
A31 (2015)
4.5 inches, 55.8 cm2 (~64.6% screen-to-body ratio)
K14x
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)
K14x
720 x 1570 pixels, 19.5:9 ratio (~256 ppi density)
OS
A31 (2015)
Android 4.4 (KitKat)
K14x
Android 15, ColorOS 15
Chipset
A31 (2015)
Qualcomm MSM8916 Snapdragon 410 (28 nm)
K14x
Mediatek Dimensity 6300 (6 nm)
CPU
A31 (2015)
Quad-core 1.2 GHz Cortex-A53
K14x
Octa-core (2x2.4 GHz Cortex-A76 & 6x2.0 GHz Cortex-A55)
GPU
A31 (2015)
Adreno 306
K14x
Mali-G57 MC2
Card slot
A31 (2015)
microSDXC (dedicated slot)
K14x
microSDXC
Internal
A31 (2015)
8GB 1GB RAM
K14x
128GB 4GB RAM, 128GB 6GB RAM
Other
A31 (2015)
eMMC 4.5
K14x
UFS 2.2
Single
A31 (2015)
8 MP, AF
K14x
-
Features
A31 (2015)
LED flash
K14x
LED flash, HDR, panorama
Video
A31 (2015)
1080p@30fps
K14x
1080p@30/60fps
Dual
A31 (2015)
-
K14x
50 MP, f/1.8, (wide), PDAF Auxiliary lens
Single
A31 (2015)
5 MP
K14x
5 MP, f/2.2, (wide)
Video
A31 (2015)
K14x
1080p@30fps
Features
A31 (2015)
-
K14x
Panorama
Loudspeaker
A31 (2015)
Yes
K14x
Yes
3.5mm jack
A31 (2015)
Yes
K14x
Yes
WLAN
A31 (2015)
Wi-Fi 802.11 b/g/n
K14x
Wi-Fi 802.11 a/b/g/n/ac, dual-band
Bluetooth
A31 (2015)
4.0, A2DP
K14x
5.4, A2DP, LE, aptX HD
Positioning
A31 (2015)
GPS
K14x
GPS, GALILEO, GLONASS, QZSS
NFC
A31 (2015)
No
K14x
No
Radio
A31 (2015)
No
K14x
Unspecified
USB
A31 (2015)
microUSB 2.0
K14x
USB Type-C 2.0, OTG
Sensors
A31 (2015)
Accelerometer, proximity
K14x
Fingerprint (side-mounted), accelerometer, proximity, compass
Type
A31 (2015)
Li-Ion 2000 mAh, non-removable
K14x
6500 mAh
Stand-by
A31 (2015)
Up to 240 h
K14x
-
Talk time
A31 (2015)
Up to 7 h
K14x
-
Charging
A31 (2015)
-
K14x
45 wired, 33W PPS, 13.5W PD 5W reverse wired
Colors
A31 (2015)
White, Blue
K14x
Prism Violet, Icy Blue
Price
A31 (2015)
About 150 EUR
K14x
About 140 EUR
Models
A31 (2015)
-
K14x
CPH2871
SAR
A31 (2015)
-
K14x
1.14 W/kg (head) 0.89 W/kg (body)