Screen size
X1b—
X4—
Quick verdict
X4 leads the measured specs 3-2.
Measured wins
X1b
2
spec wins
Ties
2
equal specs
X4
3
spec wins
Overall winner
Screen size
Technology
X1b
GSM
X4
GSM / UMTS
2G bands
X1b
GSM 900 / 1800 / 1900
X4
GSM 900 / 1800
GPRS
X1b
Yes
X4
-
EDGE
X1b
No
X4
-
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
Stereo speakers
3G bands
X1b
-
X4
UMTS 2100
Speed
X1b
-
X4
Yes, 384 kbps
Announced
X1b
2005, Q2
X4
2004, Q4
Status
X1b
Discontinued
X4
Discontinued
Dimensions
X1b
102 x 44 x 18 mm (4.02 x 1.73 x 0.71 in)
X4
89.9 x 45.1 x 24 mm (3.54 x 1.78 x 0.94 in)
Weight
X1b
86 g (3.03 oz)
X4
116 g (4.09 oz)
SIM
X1b
Mini-SIM
X4
Mini-SIM
Type
X1b
TFT, 65K colors
X4
TFT, 256K colors
Size
X1b
X4
Resolution
X1b
128 x 128 pixels, 1:1 ratio
X4
176 x 220 pixels
Other
X1b
5-way navigation key
X4
Second external 4096 colors display Downloadable pictures
Card slot
X1b
No
X4
miniSD, 32 MB included
Phonebook
X1b
Yes
X4
500 entries, Photo call
Call records
X1b
Yes
X4
Yes
Internal
X1b
16MB
X4
-
Single
X1b
CIF
X4
1.3 MP
Video
X1b
No
X4
Yes
Features
X1b
-
X4
LED flash
Other
X1b
No
X4
No
Loudspeaker
X1b
Yes
X4
No
Alert types
X1b
Vibration; Downloadable polyphonic ringtones
X4
Vibration; Downloadable polyphonic, MP3 ringtones
3.5mm jack
X1b
No
X4
No
WLAN
X1b
No
X4
No
Bluetooth
X1b
Yes
X4
No
Positioning
X1b
No
X4
No
Radio
X1b
No
X4
No
USB
X1b
X4
Proprietary
Infrared port
X1b
-
X4
Yes
Sensors
X1b
X4
Messaging
X1b
SMS, EMS, MMS
X4
SMS, MMS
Browser
X1b
WAP 2.0/xHTML
X4
WAP 2.0/xHTML
Games
X1b
Yes
X4
Yes + downloadable
Java
X1b
No
X4
Yes, MIDP 2.0
Other
X1b
Predictive text input Organizer
X4
MP3 player Predictive text input Organizer Stopwatch
Type
X1b
Removable Li-Ion battery
X4
Removable Li-Ion battery
Stand-by
X1b
Up to 200 h
X4
Up to 180 h
Talk time
X1b
Up to 3 h
X4
Up to 3 h
Colors
X1b
X4