Screen size
Classic Z511.3"
GO 1Winner: 4.0"+68%
Quick verdict
GO 1 leads the measured specs 11-2.
Measured wins
Classic Z51
2
spec wins
Ties
4
equal specs
GO 1
11
spec wins
Overall winner
Screen size
Technology
Classic Z51
GSM
GO 1
GSM / HSPA
2G bands
Classic Z51
GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 - ZM51003
GO 1
GSM 850 / 900 / 1800 / 1900
GPRS
Classic Z51
Yes
GO 1
-
EDGE
Classic Z51
No
GO 1
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
equal specs3.5mm jack
equal specsSD card
equal specsStereo speakers
-
3G bands
Classic Z51
-
GO 1
HSDPA 850 / 900 / 1900 / 2100
Speed
Classic Z51
-
GO 1
HSPA 21.1/5.76 Mbps
Announced
Classic Z51
2015, July. Released 2015, September
GO 1
2020, February. Released 2020, July 28
Status
Classic Z51
Discontinued
GO 1
Discontinued
Dimensions
Classic Z51
100.5 x 50.5 x 17.8 mm (3.96 x 1.99 x 0.70 in)
GO 1
128.5 x 65.2 x 11 mm (5.06 x 2.57 x 0.43 in)
Weight
Classic Z51
86 g (3.03 oz)
GO 1
123 g (4.34 oz)
SIM
Classic Z51
Dual SIM (Mini-SIM)
GO 1
Nano-SIM + Nano-SIM
Other
Classic Z51
Flashlight SOS button
GO 1
-
Type
Classic Z51
TFT, 65K colors
GO 1
TFT LCD
Size
Classic Z51
1.3 inches, 5.2 cm2 (~10.3% screen-to-body ratio)
GO 1
4.0 inches, 45.5 cm2 (~54.4% screen-to-body ratio)
Resolution
Classic Z51
240 x 320 pixels, 4:3 ratio (~308 ppi density)
GO 1
480 x 800 pixels, 5:3 ratio (~233 ppi density)
Card slot
Classic Z51
microSDHC
GO 1
microSDXC (dedicated slot)
Phonebook
Classic Z51
300 entries
GO 1
-
Call records
Classic Z51
Yes
GO 1
-
Internal
Classic Z51
8MB 8MB
GO 1
8GB 1GB RAM
Single
Classic Z51
1.3 MP
GO 1
5 MP
Features
Classic Z51
LED flash
GO 1
LED flash, Panorama, HDR
Video
Classic Z51
Yes
GO 1
720p
Other
Classic Z51
No
GO 1
-
Single
Classic Z51
-
GO 1
2 MP
Video
Classic Z51
-
GO 1
Loudspeaker
Classic Z51
Yes
GO 1
Yes
3.5mm jack
Classic Z51
Yes
GO 1
Yes
WLAN
Classic Z51
No
GO 1
Wi-Fi 802.11 a/b/g/n
Bluetooth
Classic Z51
3.0, EDR
GO 1
4.0, A2DP, LE
Positioning
Classic Z51
No
GO 1
GPS
NFC
Classic Z51
No
GO 1
No
Radio
Classic Z51
Stereo FM radio; built in antenna
GO 1
FM radio
USB
Classic Z51
microUSB
GO 1
microUSB 2.0
Sensors
Classic Z51
GO 1
Accelerometer
Messaging
Classic Z51
SMS
GO 1
-
Games
Classic Z51
No
GO 1
-
Java
Classic Z51
No
GO 1
-
Other
Classic Z51
Music/Video player Organizer Calendar Calculator Voice memo
GO 1
-
Type
Classic Z51
Li-Ion 800 mAh, removable
GO 1
Li-Ion 1400 mAh, removable
Charging
Classic Z51
Charging dock
GO 1
-
Stand-by
Classic Z51
Up to 130 h
GO 1
-
Talk time
Classic Z51
Up to 5 h
GO 1
-
Colors
Classic Z51
Black, White
GO 1
Black
OS
Classic Z51
-
GO 1
Android 10 (Go edition)
Chipset
Classic Z51
-
GO 1
Mediatek MT6580 (28 nm)
CPU
Classic Z51
-
GO 1
Quad-core 1.3 GHz
GPU
Classic Z51
-
GO 1
Mali-400