Screen size
Robby2Winner: 5.5"+0.9%
Y515.5"
Quick verdict
Robby2 leads the measured specs 7-4.
Measured wins
Robby2
7
spec wins
Overall winner
Ties
6
equal specs
Y51
4
spec wins
Screen size
Technology
Robby2
GSM / HSPA / LTE
Y51
GSM / HSPA
2G bands
Robby2
GSM 850 / 900 / 1800 / 1900
Y51
GSM 850 / 900 / 1800 / 1900
3G bands
Robby2
HSDPA 900 / 2100
Y51
HSDPA 850 / 900 / 1900 / 2100
4G bands
Robby2
1, 3, 7, 20
Resolution
Refresh rate
Peak brightness
Pixel density
CPU speed
RAM
Storage
Main camera
Front camera
equal specsBattery
Wired charging
Weight
Thickness
IP rating
Wi‑Fi
Bluetooth
USB
equal specs5G support
equal specsNFC
equal specs3.5mm jack
equal specsSD card
equal specsStereo speakers
Y51
-
Speed
Robby2
HSPA 21.1/5.76 Mbps, LTE Cat4 150/50 Mbps
Y51
HSPA 42.2/5.76 Mbps
Announced
Robby2
2017. Released 2017
Y51
2021, January 14
Status
Robby2
Discontinued
Y51
Available. Released 2021, January 14
Dimensions
Robby2
154.6 x 78.8 x 9.4 mm (6.09 x 3.10 x 0.37 in)
Y51
146.6 x 72.3 x 9 mm (5.77 x 2.85 x 0.35 in)
Weight
Robby2
200 g (7.05 oz)
Y51
175 g (6.17 oz)
SIM
Robby2
Dual SIM (Micro-SIM, dual stand-by)
Y51
Nano-SIM + Micro-SIM
Type
Robby2
IPS LCD
Y51
TN LCD
Size
Robby2
5.5 inches, 83.4 cm2 (~68.5% screen-to-body ratio)
Y51
5.45 inches, 76.7 cm2 (~72.3% screen-to-body ratio)
Resolution
Robby2
720 x 1280 pixels, 16:9 ratio (~267 ppi density)
Y51
480 x 960 pixels, 18:9 ratio (~197 ppi density)
OS
Robby2
Android 7.1 (Nougat)
Y51
Android 10 (Go edition)
CPU
Robby2
Quad-core 1.1 GHz Cortex-A7
Y51
Quad-core 1.3 GHz Cortex-A7
GPU
Robby2
Adreno 304
Y51
Mali-T820 MP1
Card slot
Robby2
microSDXC
Y51
microSDXC
Internal
Robby2
16GB 2GB RAM
Y51
8GB 1GB RAM, 16GB 1GB RAM
Single
Robby2
8 MP, AF
Y51
5 MP
Features
Robby2
LED flash, HDR
Y51
LED flash, HDR
Video
Robby2
720p@30fps
Y51
720p@30fps
Single
Robby2
5 MP
Y51
5 MP
Video
Robby2
Y51
Loudspeaker
Robby2
Yes, with dual speakers
Y51
Yes
3.5mm jack
Robby2
Yes
Y51
Yes
WLAN
Robby2
Wi-Fi 802.11 b/g/n
Y51
Wi-Fi 802.11 b/g/n
Bluetooth
Robby2
4.0, A2DP
Y51
4.2, A2DP
Positioning
Robby2
GPS
Y51
GPS
NFC
Robby2
No
Y51
No
Radio
Robby2
FM radio
Y51
FM Radio
USB
Robby2
microUSB 2.0, OTG
Y51
microUSB 2.0
Sensors
Robby2
Accelerometer, proximity
Y51
Accelerometer, proximity
Type
Robby2
Li-Ion 2800 mAh battery
Y51
Li-Ion 2500 mAh, removable
Colors
Robby2
Black, Gold, Rose Gold
Y51
Deep Grey, Gold, Mint
Models
Robby2
-
Y51
W-K211-TH
SAR
Robby2
-
Y51
0.70 W/kg (head) 1.55 W/kg (body)
Price
Robby2
-
Y51
About 70 EUR