Screen size
my521x1.9"
my721zWinner: 2.2"+14%
Quick verdict
my721z leads the measured specs 4-2.
Measured wins
my521x
2
spec wins
Ties
3
equal specs
my721z
4
spec wins
Overall winner
Screen size
Technology
my521x
GSM
my721z
GSM
2G bands
my521x
GSM 900 / 1800 / 1900
my721z
GSM 900 / 1800 / 1900
GPRS
my521x
Yes
my721z
Yes
EDGE
my521x
No
my721z
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
No
Announced
my521x
2008, July
my721z
2008, February. Released 2008
Status
my521x
Discontinued
my721z
Discontinued
Dimensions
my521x
107 x 46 x 10 mm (4.21 x 1.81 x 0.39 in)
my721z
106 x 52 x 12 mm (4.17 x 2.05 x 0.47 in)
Weight
my521x
90 g (3.17 oz)
my721z
125 g (4.41 oz)
SIM
my521x
Mini-SIM
my721z
Mini-SIM
Type
my521x
TFT, 65K colors
my721z
TFT, 256K colors
Size
my521x
1.9 inches, 11.4 cm2 (~23.1% screen-to-body ratio)
my721z
2.2 inches, 15.2 cm2 (~27.6% screen-to-body ratio)
Resolution
my521x
128 x 160 pixels (~108 ppi density)
my721z
176 x 220 pixels (~128 ppi density)
Other
my521x
-
my721z
Mirror effect
Card slot
my521x
microSD (dedicated slot)
my721z
microSD (dedicated slot)
Phonebook
my521x
Yes
my721z
Yes
Call records
my521x
20 dialed, 20 received, 20 missed calls
my721z
20 dialed, 20 received, 20 missed calls
Internal
my521x
10MB
my721z
-
Single
my521x
1.3 MP
my721z
3.15 MP
Video
my521x
Yes
my721z
Yes
Other
my521x
No
my721z
No
Loudspeaker
my521x
No
my721z
Yes
Alert types
my521x
Vibration; Polyphonic(32) ringtones
my721z
Vibration; Polyphonic ringtones
3.5mm jack
my521x
No
my721z
No
WLAN
my521x
No
my721z
No
Bluetooth
my521x
Yes
my721z
Yes
Positioning
my521x
No
my721z
No
Radio
my521x
No
my721z
Stereo FM radio, RDS
USB
my521x
Proprietary
my721z
Proprietary
Sensors
my521x
my721z
Messaging
my521x
SMS, EMS, MMS
my721z
SMS, MMS, Instant Messaging
Browser
my521x
WAP 2.0/xHTML
my721z
WAP 2.0/xHTML
Games
my521x
Yes
my721z
Yes
Java
my521x
Yes, MIDP 2.0
my721z
Yes, MIDP 2.0
Other
my521x
MP3/AAC player Predictive text input Organizer
my721z
Music player Predictive text input Organizer
Type
my521x
Removable Li-Ion battery
my721z
Removable Li-Ion battery
Stand-by
my521x
Up to 200 h
my721z
Up to 200 h
Talk time
my521x
Up to 3 h
my721z
Up to 3 h
Colors
my521x
Black,Silver
my721z
Silver