Screen size
equal specsEF512.2"
EF812.2"
Quick verdict
EF81 leads the measured specs 4-3.
Measured wins
EF51
3
spec wins
Ties
4
equal specs
EF81
4
spec wins
Overall winner
Screen size
equal specsTechnology
EF51
GSM
EF81
GSM / UMTS
2G bands
EF51
GSM 900 / 1800 / 1900 , GSM 850 / 1800 / 1900 - US version
EF81
GSM 900 / 1800 / 1900
GPRS
EF51
Class 10
EF81
-
EDGE
EF51
No
EF81
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
3.5mm jack
equal specsSD card
equal specsStereo speakers
-
3G bands
EF51
-
EF81
UMTS 2100
Speed
EF51
-
EF81
Yes, 384 kbps
Announced
EF51
2006, February
EF81
2006, January
Status
EF51
Discontinued
EF81
Discontinued
Dimensions
EF51
89 x 49 x 18 mm (3.50 x 1.93 x 0.71 in)
EF81
94 x 51 x 15.9 mm (3.70 x 2.01 x 0.63 in)
Weight
EF51
95 g (3.35 oz)
EF81
110 g (3.88 oz)
SIM
EF51
Mini-SIM
EF81
Mini-SIM
Type
EF51
TFT, 256K colors
EF81
TFT, 256K colors
Size
EF51
2.2 inches, 40 x 40 mm, 15.6 cm2 (~35.7% screen-to-body ratio)
EF81
2.2 inches, 34 x 45 mm, 15.0 cm2 (~31.3% screen-to-body ratio)
Resolution
EF51
120 x 128 pixels (~80 ppi density)
EF81
240 x 320 pixels, 4:3 ratio (~182 ppi density)
Other
EF51
-
EF81
Second external 256K colors display, TFT (120 x 160 pixels) Aluminum rear cover
Card slot
EF51
miniSD
EF81
microSD (dedicated slot)
Phonebook
EF51
Yes, Photo call
EF81
500 x 20 fields, Photo call
Call records
EF51
10 dialed, 10 received, 10 missed calls
EF81
100 dialed, 100 received, 100 missed calls
Internal
EF51
20MB
EF81
64MB
Single
EF51
1.3 MP
EF81
2 MP
Video
EF51
No
EF81
Yes
Features
EF51
-
EF81
rotating lens
Other
EF51
No
EF81
No
Loudspeaker
EF51
No
EF81
No
Alert types
EF51
Vibration; Downloadable polyphonic, MP3 ringtones
EF81
Vibration; Downloadable polyphonic, AAC ringtones
3.5mm jack
EF51
No
EF81
No
Other
EF51
3D surround sound
EF81
-
WLAN
EF51
No
EF81
No
Bluetooth
EF51
1.2, A2DP
EF81
Yes
Positioning
EF51
No
EF81
No
Radio
EF51
FM radio
EF81
No
USB
EF51
Proprietary
EF81
Proprietary
Sensors
EF51
EF81
Messaging
EF51
SMS, MMS
EF81
SMS, MMS, Email
Browser
EF51
WAP 2.0/xHTML
EF81
WAP 2.0/xHTML, HTML
Games
EF51
Yes + downloadable
EF81
5 - StarWars, SeaBattle, SuperBomber + downloadable
Java
EF51
Yes, MIDP 2.0
EF81
Yes, MIDP 2.0
Other
EF51
WMA/MP3/AAC/AAC+ player Predictive text input Voice memo Stopwatch Organizer
EF81
Video telephony MP3/AAC player Video player Photo editor Predictive text input Voice dial Stopwatch Organizer
Type
EF51
Removable Li-Ion 870 mAh battery
EF81
Removable Li-Ion 950 mAh battery
Stand-by
EF51
Up to 200 h
EF81
Up to 300 h
Talk time
EF51
Up to 4 h
EF81
Up to 4 h 30 min
Colors
EF51
Flashy White, Black
EF81
Titanium Silver