Screen size
A2Winner: 4.0"+30%
KT21 Express2.8"
Quick verdict
A2 leads the measured specs 6-1.
Measured wins
A2
6
spec wins
Overall winner
Ties
5
equal specs
KT21 Express
1
spec wins
Screen size
Technology
A2
GSM
KT21 Express
No cellular connectivity
2G bands
A2
GSM 900 / 1800 / 1900 - SIM 1 & SIM 2
KT21 Express
GSM - SIM 1 & SIM 2
GPRS
A2
Yes
KT21 Express
Yes
EDGE
A2
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
A2
2013, March. Released 2013, March
KT21 Express
2012
Status
A2
Discontinued
KT21 Express
Discontinued
Dimensions
A2
124 x 63.6 x 12.4 mm (4.88 x 2.50 x 0.49 in)
KT21 Express
-
Weight
A2
110 g (3.88 oz)
KT21 Express
-
SIM
A2
Dual SIM (Mini-SIM)
KT21 Express
Dual SIM (Mini-SIM)
Type
A2
TFT
KT21 Express
TFT
Size
A2
4.0 inches, 45.5 cm2 (~57.7% screen-to-body ratio)
KT21 Express
2.8 inches, 24.3 cm2
Resolution
A2
480 x 800 pixels, 5:3 ratio (~233 ppi density)
KT21 Express
240 x 320 pixels, 4:3 ratio
OS
A2
Android 2.3.6 (Gingerbread)
KT21 Express
-
Card slot
A2
microSDHC (dedicated slot)
KT21 Express
microSDHC (dedicated slot)
Internal
A2
200MB
KT21 Express
-
Phonebook
A2
-
KT21 Express
2000 entries
Call records
A2
-
KT21 Express
Yes
Single
A2
3.15 MP
KT21 Express
3.15 MP
Video
A2
Yes
KT21 Express
Yes
Features
A2
-
KT21 Express
LED flash
Single
A2
Yes
KT21 Express
-
Video
A2
KT21 Express
-
Other
A2
-
KT21 Express
No
Loudspeaker
A2
Yes
KT21 Express
Yes
3.5mm jack
A2
Yes
KT21 Express
Yes
WLAN
A2
No
KT21 Express
No
Bluetooth
A2
Yes
KT21 Express
2.0
Positioning
A2
No
KT21 Express
No
NFC
A2
No
KT21 Express
No
Radio
A2
FM radio
KT21 Express
FM radio, recording
USB
A2
Proprietary
KT21 Express
microUSB
Sensors
A2
Accelerometer
KT21 Express
Proximity
Messaging
A2
-
KT21 Express
SMS, MMS, Email
Games
A2
-
KT21 Express
Yes
Java
A2
-
KT21 Express
Yes
Other
A2
-
KT21 Express
Audio/video player Photo viewer Organizer
Type
A2
Li-Ion 1750 mAh battery
KT21 Express
Li-Ion 1000 mAh, removable
Stand-by
A2
Up to 120 h
KT21 Express
-
Talk time
A2
Up to 3 h 30 min
KT21 Express
-
Colors
A2
White/Black
KT21 Express
Black
Price
A2
About 70 EUR
KT21 Express
About 40 EUR