Screen size
A51—
SL75—
Quick verdict
SL75 leads the measured specs 3-2.
Measured wins
A51
2
spec wins
Ties
4
equal specs
SL75
3
spec wins
Overall winner
Screen size
Technology
A51
GSM
SL75
GSM
2G bands
A51
GSM 900 / 1800
SL75
GSM 900 / 1800 / 1900
GPRS
A51
SL75
Class 10
EDGE
A51
No
SL75
Yes
Resolution
Refresh rate
Peak brightness
Pixel density
CPU speed
RAM
Storage
Main camera
Front camera
Battery
equal specsWired charging
Weight
Thickness
IP rating
Wi‑Fi
Bluetooth
USB
5G support
equal specsNFC
3.5mm jack
equal specsSD card
equal specsStereo speakers
Announced
A51
2004, Q4
SL75
2005, Q2
Status
A51
Discontinued
SL75
Discontinued
Dimensions
A51
103 x 46 x 21 mm, 75 cc (4.06 x 1.81 x 0.83 in)
SL75
92 x 48 x 23 mm, 78 cc (3.62 x 1.89 x 0.91 in)
Weight
A51
84 g (2.96 oz)
SL75
99 g (3.49 oz)
SIM
A51
Mini-SIM
SL75
Mini-SIM
Type
A51
Monochrome graphic
SL75
TFT, 256K colors
Size
A51
SL75
Resolution
A51
101 x 64 pixels, 5 lines
SL75
132 x 176 pixels, 4:3 ratio
Other
A51
Screensavers
SL75
-
Card slot
A51
No
SL75
No
Phonebook
A51
50 entries
SL75
1000 x 23 fields, Photo call
Call records
A51
10 dialed, 10 received, 10 missed calls
SL75
100 dialed, 100 received, 100 missed calls
Internal
A51
-
SL75
52MB
Other
A51
No
SL75
-
Loudspeaker
A51
No
SL75
No
Alert types
A51
Downloadable polyphonic ringtones
SL75
Vibration; Downloadable polyphonic, MP3, AAC ringtones
3.5mm jack
A51
No
SL75
No
WLAN
A51
No
SL75
No
Bluetooth
A51
No
SL75
1.2
Positioning
A51
No
SL75
No
Radio
A51
No
SL75
No
USB
A51
SL75
Proprietary
Sensors
A51
SL75
Messaging
A51
SMS, EMS
SL75
SMS, MMS, Email, Instant Messaging
Browser
A51
WAP 1.2.1
SL75
WAP 2.0/xHTML
Games
A51
Stack Attack and Wacko
SL75
SeaBattle, Wappo 2, Golf + downloadable
Java
A51
No
SL75
Yes, MIDP 2.0
Other
A51
Predictive text input Currency converter Calculator Exchangable covers
SL75
MP3/AAC/MP4 player Predictive text input Organizer Voice memo
Type
A51
Removable Li-Ion 700 mAh battery
SL75
Removable Li-Ion 700 mAh battery
Stand-by
A51
Up to 250 h
SL75
Up to 300 h
Talk time
A51
Up to 5 h
SL75
Up to 5 h
Colors
A51
Urban Grey
SL75
Pure Silver, Polar White, Onyx Black
Single
A51
-
SL75
1.3 MP
Features
A51
-
SL75
LED flash
Video
A51
-
SL75
Yes
Other
A51
-
SL75
No