Screen size
A40Winner: 4.0"+40%
C512.4"
Quick verdict
A40 leads the measured specs 9-0.
Measured wins
A40
9
spec wins
Overall winner
Ties
5
equal specs
C51
0
spec wins
Screen size
Technology
A40
GSM
C51
GSM
2G bands
A40
GSM 900 / 1800 - SIM 1 & SIM 2
C51
GSM 900 / 1800 - SIM 1 & SIM 2
GPRS
A40
Yes
C51
No
EDGE
A40
Yes
C51
No
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
equal specsUSB
5G support
equal specsNFC
equal specs3.5mm jack
equal specsSD card
equal specsStereo speakers
Announced
A40
2014, January. Released 2014, January
C51
2014
Status
A40
Discontinued
C51
Discontinued
Dimensions
A40
126.2 x 64 x 10.8 mm (4.97 x 2.52 x 0.43 in)
C51
-
Weight
A40
126.5 (4.44 oz)
C51
-
SIM
A40
Dual SIM
C51
Dual SIM
Type
A40
TFT
C51
TFT
Size
A40
4.0 inches, 45.5 cm2 (~56.4% screen-to-body ratio)
C51
2.4 inches, 17.8 cm2
Resolution
A40
480 x 800 pixels, 5:3 ratio (~233 ppi density)
C51
240 x 320 pixels, 4:3 ratio (~167 ppi density)
OS
A40
Android 4.2.2 (Jelly Bean)
C51
-
CPU
A40
Dual-core 1.3 GHz
C51
-
Card slot
A40
microSDHC (dedicated slot)
C51
microSDHC
Internal
A40
4GB 512MB RAM
C51
-
Phonebook
A40
-
C51
Yes
Call records
A40
-
C51
Yes
Single
A40
5 MP
C51
1.3 MP
Video
A40
Yes
C51
Yes
Single
A40
VGA
C51
-
Video
A40
C51
-
Other
A40
-
C51
No
Loudspeaker
A40
Yes
C51
Yes
3.5mm jack
A40
Yes
C51
Yes
WLAN
A40
Wi-Fi 802.11 b/g/n, hotspot
C51
No
Bluetooth
A40
2.0
C51
2.0
Positioning
A40
GPS
C51
No
NFC
A40
No
C51
No
Radio
A40
FM radio
C51
FM radio
USB
A40
microUSB 2.0
C51
microUSB
Sensors
A40
Accelerometer, proximity
C51
Messaging
A40
-
C51
SMS
Games
A40
-
C51
Yes
Java
A40
-
C51
No
Other
A40
-
C51
Audio/video player
Type
A40
Li-Ion 1500 mAh battery
C51
Li-Ion 1000 mAh, removable
Colors
A40
White, Yellow, Blue
C51
Brown, Champagne, Black