Screen size
C28Winner: 2.0"+4.5%
U11.9"
Quick verdict
C28 leads the measured specs 4-3.
Measured wins
C28
4
spec wins
Overall winner
Ties
4
equal specs
U1
3
spec wins
Screen size
Technology
C28
No cellular connectivity
U1
No cellular connectivity
2G bands
C28
N/A
U1
N/A
3G bands
C28
N/A
U1
N/A
4G bands
C28
N/A
U1
N/A
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
Speed
C28
No
U1
No
GPRS
C28
No
U1
No
EDGE
C28
No
U1
No
Announced
C28
2024, August
U1
2025, February
Status
C28
Available. Released 2024, August
U1
Available. Released 2025, February
Dimensions
C28
58.3 x 46.1 x 13.3 mm (2.30 x 1.81 x 0.52 in)
U1
49.8 x 42.4 x 11.4 mm (1.96 x 1.67 x 0.45 in)
Weight
C28
44.5 g (1.59 oz)
U1
43.8 g (1.55 oz)
Build
C28
Zinc alloy frame
U1
-
SIM
C28
No
U1
No
Other
C28
1 ATM waterproof
U1
Waterproof (1ATM)
Type
C28
TFT LCD
U1
TFT LCD
Size
C28
2.02 inches
U1
1.93 inches
Resolution
C28
320 x 390 pixels (~250 ppi density)
U1
240 x 288 pixels (~194 ppi density)
OS
C28
Proprietary OS
U1
Proprietary OS
Card slot
C28
No
U1
No
Internal
C28
128Mb
U1
16MB
Other
C28
No
U1
No
Loudspeaker
C28
Yes
U1
Yes
3.5mm jack
C28
No
U1
No
WLAN
C28
No
U1
No
Bluetooth
C28
Yes
U1
5.4, A2DP, LE
Positioning
C28
No
U1
No
NFC
C28
No
U1
No
Radio
C28
No
U1
No
USB
C28
No
U1
No
Sensors
C28
Accelerometer, heart rate, SpO2, blood pressure
U1
Accelerometer, gyro, heart rate, SpO2
Type
C28
410 mAh
U1
300 mAh
Colors
C28
Black, Green
U1
Black, Pink