Screen size
A3Winner: 4.0"+30%
KT21 Express2.8"
Quick verdict
A3 leads the measured specs 7-1.
Measured wins
A3
7
spec wins
Overall winner
Ties
5
equal specs
KT21 Express
1
spec wins
Screen size
Technology
A3
GSM
KT21 Express
No cellular connectivity
2G bands
A3
GSM 850 / 1900 - SIM 1 & SIM 2, GSM 900 / 1800 - SIM 1 & SIM 2
KT21 Express
GSM - SIM 1 & SIM 2
GPRS
A3
Yes
KT21 Express
Yes
EDGE
A3
Yes
KT21 Express
Resolution
Refresh rate
Peak brightness
Pixel density
CPU speed
RAM
Storage
Main camera
equal specsFront camera
Battery
Wired charging
Weight
Thickness
IP rating
Wi‑Fi
Bluetooth
USB
5G support
equal specsNFC
equal specs3.5mm jack
equal specsSD card
equal specsStereo speakers
Yes
Announced
A3
2013, March. Released 2013, March
KT21 Express
2012
Status
A3
Discontinued
KT21 Express
Discontinued
Dimensions
A3
113 x 61 x 13.5 mm (4.45 x 2.40 x 0.53 in)
KT21 Express
-
Weight
A3
90 g (3.17 oz)
KT21 Express
-
SIM
A3
Dual SIM (Mini-SIM)
KT21 Express
Dual SIM (Mini-SIM)
Type
A3
TFT
KT21 Express
TFT
Size
A3
4.0 inches, 47.6 cm2 (~69.1% screen-to-body ratio)
KT21 Express
2.8 inches, 24.3 cm2
Resolution
A3
320 x 480 pixels, 3:2 ratio (~144 ppi density)
KT21 Express
240 x 320 pixels, 4:3 ratio
OS
A3
Android 2.3.6 (Gingerbread)
KT21 Express
-
CPU
A3
1.0 GHz
KT21 Express
-
Card slot
A3
microSDHC (dedicated slot)
KT21 Express
microSDHC (dedicated slot)
Internal
A3
256MB RAM, 512MB
KT21 Express
-
Phonebook
A3
-
KT21 Express
2000 entries
Call records
A3
-
KT21 Express
Yes
Single
A3
3.15 MP
KT21 Express
3.15 MP
Video
A3
Yes
KT21 Express
Yes
Features
A3
-
KT21 Express
LED flash
Single
A3
VGA
KT21 Express
-
Video
A3
KT21 Express
-
Other
A3
-
KT21 Express
No
Loudspeaker
A3
Yes
KT21 Express
Yes
3.5mm jack
A3
Yes
KT21 Express
Yes
WLAN
A3
Wi-Fi 802.11 b/g/n, hotspot
KT21 Express
No
Bluetooth
A3
Yes
KT21 Express
2.0
Positioning
A3
No
KT21 Express
No
NFC
A3
No
KT21 Express
No
Radio
A3
FM radio
KT21 Express
FM radio, recording
USB
A3
Proprietary
KT21 Express
microUSB
Sensors
A3
Accelerometer
KT21 Express
Proximity
Messaging
A3
-
KT21 Express
SMS, MMS, Email
Games
A3
-
KT21 Express
Yes
Java
A3
-
KT21 Express
Yes
Other
A3
-
KT21 Express
Audio/video player Photo viewer Organizer
Type
A3
Li-Ion 1400 mAh battery
KT21 Express
Li-Ion 1000 mAh, removable
Stand-by
A3
Up to 250 h
KT21 Express
-
Talk time
A3
Up to 4 h 20 min
KT21 Express
-
Colors
A3
White/Black
KT21 Express
Black
Price
A3
About 70 EUR
KT21 Express
About 40 EUR