Screen size
EF812.2"
P51Winner: 2.8"+21%
Quick verdict
P51 leads the measured specs 4-3.
Measured wins
EF81
3
spec wins
Ties
4
equal specs
P51
4
spec wins
Overall winner
Screen size
Technology
EF81
GSM / UMTS
P51
GSM
2G bands
EF81
GSM 900 / 1800 / 1900
P51
GSM 850 / 900 / 1800 / 1900
3G bands
EF81
UMTS 2100
P51
-
Speed
EF81
Yes, 384 kbps
P51
Resolution
equal specsRefresh 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
-
GPRS
EF81
-
P51
Class 10
EDGE
EF81
-
P51
No
Announced
EF81
2006, January
P51
2006, March
Status
EF81
Discontinued
P51
Discontinued
Dimensions
EF81
94 x 51 x 15.9 mm (3.70 x 2.01 x 0.63 in)
P51
122 x 60 x 20 mm, 130 cc (4.80 x 2.36 x 0.79 in)
Weight
EF81
110 g (3.88 oz)
P51
170 g (6.00 oz)
SIM
EF81
Mini-SIM
P51
Mini-SIM
Keyboard
EF81
-
P51
QWERTY
Type
EF81
TFT, 256K colors
P51
TFT resistive touchscreen, 256K colors
Size
EF81
2.2 inches, 34 x 45 mm, 15.0 cm2 (~31.3% screen-to-body ratio)
P51
2.8 inches, 42 x 57 mm, 24.3 cm2 (~33.2% screen-to-body ratio)
Resolution
EF81
240 x 320 pixels, 4:3 ratio (~182 ppi density)
P51
240 x 320 pixels, 4:3 ratio (~143 ppi density)
Other
EF81
Second external 256K colors display, TFT (120 x 160 pixels) Aluminum rear cover
P51
5-way navigation stick
Card slot
EF81
microSD (dedicated slot)
P51
MMC/SDIO
Phonebook
EF81
500 x 20 fields, Photo call
P51
-
Call records
EF81
100 dialed, 100 received, 100 missed calls
P51
-
Internal
EF81
64MB
P51
64MB RAM, 192MB ROM
Single
EF81
2 MP
P51
1.3 MP
Features
EF81
rotating lens
P51
-
Video
EF81
Yes
P51
QCIF
Other
EF81
No
P51
No
Loudspeaker
EF81
No
P51
Yes
Alert types
EF81
Vibration; Downloadable polyphonic, AAC ringtones
P51
Vibration; Downloadable polyphonic, MP3 ringtones
3.5mm jack
EF81
No
P51
No
WLAN
EF81
No
P51
Wi-Fi 802.11b/g, VoIP via Wi-Fi
Bluetooth
EF81
Yes
P51
1.2, A2DP
Positioning
EF81
No
P51
GPS
Radio
EF81
No
P51
No
USB
EF81
Proprietary
P51
Proprietary
Sensors
EF81
P51
Messaging
EF81
SMS, MMS, Email
P51
-
Browser
EF81
WAP 2.0/xHTML, HTML
P51
WAP 2.0/xHTML, HTML
Games
EF81
5 - StarWars, SeaBattle, SuperBomber + downloadable
P51
-
Java
EF81
Yes, MIDP 2.0
P51
-
Other
EF81
Video telephony MP3/AAC player Video player Photo editor Predictive text input Voice dial Stopwatch Organizer
P51
MP3/MP4 player Handwriting recognition Pocket Office Voice command
Type
EF81
Removable Li-Ion 950 mAh battery
P51
Removable Li-Ion 1370 mAh battery
Stand-by
EF81
Up to 300 h
P51
Up to 150 h
Talk time
EF81
Up to 4 h 30 min
P51
Up to 4 h
Colors
EF81
Titanium Silver
P51
OS
EF81
-
P51
Microsoft Windows Mobile 5.0 PocketPC
CPU
EF81
-
P51
32-bit Intel XScale PXA272 416 MHz