i have inserted a nano sim card on kingfisher board and tried call but could call is not connecting (operator saying switch off)
Hello Aditya_Chawla,
KF BSP doesn't support sim.
See below for supported functions.
https://elinux.org/R-Car/Boards/Kingfisher/Yocto-Gen3/v5.9.0#S.2FW_support_status