Why is phone : sim status set , service state , in service status

why is cellular

network state is showing disconnected

why come on the sim status service state in service

why come cellular network state show disconnected

why come is custom build version is show blu-n110u_v12_generic_marshmallow 05-09-2016 17; 00

sim toolkit in not ready or unsupported

dual-sim not working

error message read processor not working