Screen size
A21Winner: 4.5"+4.4%
A27 Retina4.3"
Quick verdict
A27 Retina leads the measured specs 6-3.
Measured wins
A21
3
spec wins
Ties
7
equal specs
A27 Retina
6
spec wins
Overall winner
Screen size
Technology
A21
GSM / HSPA
A27 Retina
GSM / HSPA
2G bands
A21
GSM 900 / 1800 / 1900 - SIM 1 & SIM 2
A27 Retina
GSM 900 / 1800 / 1900 - SIM 1 & SIM 2
3G bands
A21
HSDPA 2100
A27 Retina
HSDPA 2100
Speed
A21
HSPA 7.2/0.384 Mbps
Resolution
Refresh rate
Peak brightness
Pixel density
CPU speed
equal specsRAM
Storage
equal specsMain camera
Front camera
Battery
equal specsWired charging
Weight
Thickness
IP rating
Wi‑Fi
Bluetooth
USB
5G support
equal specsNFC
equal specs3.5mm jack
equal specsSD card
equal specsStereo speakers
A27 Retina
HSPA 7.2/0.384 Mbps
Announced
A21
2012
A27 Retina
2013, March. Released 2013, March
Status
A21
Discontinued
A27 Retina
Discontinued
Dimensions
A21
-
A27 Retina
133.6 x 66 x 9.1 mm (5.26 x 2.60 x 0.36 in)
Weight
A21
-
A27 Retina
126.5 g (4.44 oz)
SIM
A21
Dual SIM (Mini-SIM)
A27 Retina
Dual SIM (Mini-SIM)
Type
A21
TFT, 256K colors
A27 Retina
IPS LCD
Size
A21
4.5 inches, 57.6 cm2
A27 Retina
4.3 inches, 51.0 cm2 (~57.8% screen-to-body ratio)
Resolution
A21
480 x 800 pixels, 5:3 ratio (~207 ppi density)
A27 Retina
540 x 960 pixels, 16:9 ratio (~256 ppi density)
OS
A21
Android 4.0 (Ice Cream Sandwich)
A27 Retina
Android 4.1 (Jelly Bean)
CPU
A21
Dual-core 1.2 GHz
A27 Retina
Dual-core 1.2 GHz
Card slot
A21
microSDHC (dedicated slot)
A27 Retina
microSDHC (dedicated slot)
Internal
A21
4GB 512MB RAM
A27 Retina
4GB 512MB RAM
Single
A21
5 MP, AF
A27 Retina
8 MP, AF
Features
A21
LED flash
A27 Retina
LED flash
Video
A21
Yes
A27 Retina
Yes
Single
A21
1.3 MP
A27 Retina
2 MP
Video
A21
A27 Retina
Loudspeaker
A21
Yes
A27 Retina
Yes
3.5mm jack
A21
Yes
A27 Retina
Yes
WLAN
A21
Wi-Fi 802.11 b/g/n
A27 Retina
Wi-Fi 802.11 b/g/n, Wi-Fi Direct, hotspot
Bluetooth
A21
2.1, A2DP
A27 Retina
Yes
Positioning
A21
GPS
A27 Retina
GPS
NFC
A21
No
A27 Retina
No
Radio
A21
No
A27 Retina
FM radio
USB
A21
microUSB 2.0
A27 Retina
Proprietary
Sensors
A21
Accelerometer, proximity
A27 Retina
Accelerometer
Type
A21
Li-Ion 1800 mAh, removable
A27 Retina
Li-Ion 1800 mAh battery
Stand-by
A21
Up to 200 h
A27 Retina
Up to 180 h
Talk time
A21
Up to 5 h
A27 Retina
Up to 4 h
Colors
A21
Pearl White
A27 Retina
Black
SAR EU
A21
0.44 W/kg (head)
A27 Retina
1.00 W/kg (head)
Price
A21
About 130 EUR
A27 Retina
About 160 EUR