my jio sim was say out of call service or switch off during someone call me why?

Step 1: you turn on your mobile flight                       mode and after 10seconds to                       turn  off your flight mode.

Step 2:you check your call working or not.

Step 3:Your Mobile calling was worked                     you will be enjoy.

Step 4: or your mobile calling was not                       working. ["You note the step 5"].

                           "Important"

Step 5: you go to your mobile network  settings and check on your LTE 4G Mode option in jio sim network.

Step 6: if the jio LTE  4G mode was                           disabled. you turn on the LTE 4G                   Mode option.

Final : you receive your jio network calling             service. And enjoy your calling                     service.

                        "Thanking you"