Screen size
A664.5"
S1Winner: 5.0"+10%
Quick verdict
S1 leads the measured specs 11-2.
Measured wins
A66
2
spec wins
Ties
4
equal specs
S1
11
spec wins
Overall winner
Screen size
Technology
A66
GSM
S1
GSM / HSPA
2G bands
A66
GSM 900 / 1800 - SIM 1 & SIM 2
S1
GSM 900 / 1800 - SIM 1 & SIM 2
GPRS
A66
Yes
S1
-
EDGE
A66
Yes
S1
-
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
USB
5G support
equal specsNFC
equal specs3.5mm jack
equal specsSD card
equal specsStereo speakers
3G bands
A66
-
S1
HSDPA 2100
Speed
A66
-
S1
HSPA
Announced
A66
2014
S1
2014, February. Released 2014, February
Status
A66
Discontinued
S1
Discontinued
Dimensions
A66
136 x 67.2 x 11 mm (5.35 x 2.65 x 0.43 in)
S1
144 x 71 x 8.9 mm (5.67 x 2.80 x 0.35 in)
Weight
A66
98 g (3.46 oz)
S1
137 g (4.83 oz)
SIM
A66
Dual SIM
S1
Dual SIM
Type
A66
TFT
S1
IPS LCD
Size
A66
4.5 inches, 55.8 cm2 (~61.1% screen-to-body ratio)
S1
5.0 inches, 68.9 cm2 (~67.4% screen-to-body ratio)
Resolution
A66
480 x 854 pixels, 16:9 ratio (~218 ppi density)
S1
1080 x 1920 pixels, 16:9 ratio (~441 ppi density)
OS
A66
Android 4.1.2 (Jelly Bean)
S1
Android 4.2.1 (Jelly Bean)
CPU
A66
Dual-core 1.2 GHz
S1
Quad-core 1.5 GHz
Card slot
A66
microSDHC
S1
microSDHC (dedicated slot)
Internal
A66
4GB 512MB RAM
S1
16GB 1GB RAM
Single
A66
3.15 MP
S1
13 MP, AF
Features
A66
LED flash
S1
LED flash
Video
A66
Yes
S1
Yes
Single
A66
VGA
S1
8 MP
Video
A66
S1
Loudspeaker
A66
Yes
S1
Yes
3.5mm jack
A66
Yes
S1
Yes
WLAN
A66
Wi-Fi 802.11 b/g/n, hotspot
S1
Wi-Fi 802.11 b/g/n, hotspot
Bluetooth
A66
2.0
S1
4.0, A2DP
Positioning
A66
GPS
S1
GPS
NFC
A66
No
S1
No
Radio
A66
FM radio
S1
FM radio
USB
A66
microUSB
S1
microUSB 2.0
Sensors
A66
Accelerometer, proximity
S1
Accelerometer, proximity
Type
A66
Li-Ion 2000 mAh battery
S1
Li-Ion 2300 mAh battery
Stand-by
A66
Up to 160 h
S1
-
Talk time
A66
Up to 5 h
S1
-
Colors
A66
White, Black
S1
Black
SAR EU
A66
0.38 W/kg (head) 0.47 W/kg (body)
S1
-