Screen size
C28Winner: 2.0"+14%
X31.7"
Quick verdict
X3 leads the measured specs 4-3.
Measured wins
C28
3
spec wins
Ties
4
equal specs
X3
4
spec wins
Overall winner
Screen size
Technology
C28
No cellular connectivity
X3
No cellular connectivity
2G bands
C28
N/A
X3
N/A
3G bands
C28
N/A
X3
N/A
4G bands
C28
N/A
X3
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
X3
No
GPRS
C28
No
X3
No
EDGE
C28
No
X3
No
Announced
C28
2024, August
X3
2025, March
Status
C28
Available. Released 2024, August
X3
Available. Released 2025, March
Dimensions
C28
58.3 x 46.1 x 13.3 mm (2.30 x 1.81 x 0.52 in)
X3
53.8 x 53.8 x 13.5 mm (2.12 x 2.12 x 0.53 in)
Weight
C28
44.5 g (1.59 oz)
X3
94.6 g (3.35 oz)
Build
C28
Zinc alloy frame
X3
Zinc alloy frame and rear
SIM
C28
No
X3
No
Other
C28
1 ATM waterproof
X3
Waterproof (5ATM)
Type
C28
TFT LCD
X3
TFT LCD
Size
C28
2.02 inches
X3
1.73 inches
Resolution
C28
320 x 390 pixels (~250 ppi density)
X3
466 x 466 pixels (~381 ppi density)
OS
C28
Proprietary OS
X3
Proprietary OS
Card slot
C28
No
X3
No
Internal
C28
128Mb
X3
16MB
Other
C28
No
X3
No
Loudspeaker
C28
Yes
X3
Yes
3.5mm jack
C28
No
X3
No
WLAN
C28
No
X3
No
Bluetooth
C28
Yes
X3
5.3, A2DP
Positioning
C28
No
X3
Unspecified
NFC
C28
No
X3
No
Radio
C28
No
X3
No
USB
C28
No
X3
No
Sensors
C28
Accelerometer, heart rate, SpO2, blood pressure
X3
Accelerometer, heart rate, SpO2, barometer, compass
Type
C28
410 mAh
X3
900 mAh
Colors
C28
Black, Green
X3
Black