Screen size
my421x1.8"
my521xWinner: 1.9"+5.3%
Quick verdict
my421x leads the measured specs 2-1.
Measured wins
my421x
2
spec wins
Overall winner
Ties
6
equal specs
my521x
1
spec wins
Screen size
Technology
my421x
GSM
my521x
GSM
2G bands
my421x
GSM 900 / 1800
my521x
GSM 900 / 1800 / 1900
GPRS
my421x
Yes
my521x
Yes
EDGE
my421x
No
my521x
No
Resolution
equal specsRefresh rate
Peak brightness
Pixel density
CPU speed
RAM
Storage
Main camera
equal specsFront camera
Battery
Wired charging
Weight
Thickness
equal specsIP rating
Wi‑Fi
Bluetooth
USB
5G support
equal specsNFC
3.5mm jack
equal specsSD card
equal specsStereo speakers
Announced
my421x
2008, February. Released 2008
my521x
2008, July
Status
my421x
Discontinued
my521x
Discontinued
Dimensions
my421x
107 x 47 x 10 mm (4.21 x 1.85 x 0.39 in)
my521x
107 x 46 x 10 mm (4.21 x 1.81 x 0.39 in)
Weight
my421x
81 g (2.86 oz)
my521x
90 g (3.17 oz)
SIM
my421x
Mini-SIM
my521x
Mini-SIM
Type
my421x
CSTN, 65K colors
my521x
TFT, 65K colors
Size
my421x
1.8 inches, 10.2 cm2 (~20.3% screen-to-body ratio)
my521x
1.9 inches, 11.4 cm2 (~23.1% screen-to-body ratio)
Resolution
my421x
128 x 160 pixels (~114 ppi density)
my521x
128 x 160 pixels (~108 ppi density)
Other
my421x
Glossy effect
my521x
-
Card slot
my421x
microSD (dedicated slot)
my521x
microSD (dedicated slot)
Phonebook
my421x
Yes
my521x
Yes
Call records
my421x
20 dialed, 20 received, 20 missed calls
my521x
20 dialed, 20 received, 20 missed calls
Internal
my421x
-
my521x
10MB
Single
my421x
1.3 MP
my521x
1.3 MP
Video
my421x
Yes
my521x
Yes
Other
my421x
No
my521x
No
Loudspeaker
my421x
Yes
my521x
No
Alert types
my421x
Vibration; Polyphonic ringtones
my521x
Vibration; Polyphonic(32) ringtones
3.5mm jack
my421x
No
my521x
No
WLAN
my421x
No
my521x
No
Bluetooth
my421x
Yes
my521x
Yes
Positioning
my421x
No
my521x
No
Radio
my421x
Stereo FM radio, RDS
my521x
No
USB
my421x
Proprietary
my521x
Proprietary
Sensors
my421x
my521x
Messaging
my421x
SMS, MMS
my521x
SMS, EMS, MMS
Browser
my421x
WAP 2.0/xHTML
my521x
WAP 2.0/xHTML
Games
my421x
Yes
my521x
Yes
Java
my421x
Yes, MIDP 2.0
my521x
Yes, MIDP 2.0
Other
my421x
Music player Predictive text input Organizer
my521x
MP3/AAC player Predictive text input Organizer
Type
my421x
Removable Li-Ion battery
my521x
Removable Li-Ion battery
Stand-by
my421x
Up to 220 h
my521x
Up to 200 h
Talk time
my421x
Up to 3 h 40 min
my521x
Up to 3 h
Colors
my421x
Black
my521x
Black,Silver