Check the setting of answering method on your cell phone and confirm if need some setting when connecting the Bluetooth device.
Type: Open-ear
Model: OpenReal
Color: Black
Driver: φ16.2mm dynamic driver
Frequency response range: 20Hz - 20kHz
Audio codec: AAC/SBC
Call noise cancellation: Dual-mic ENC call noise reduction
Bluetooth version: Bluetooth 5.3
Effective Bluetooth range: 10m
Battery capacity: 120mAh
Music play time (AAC, default setting, 50% volume)*: 16h
Cable charge time: 1h
Charging port: Magnetic charging