Interconnect Usage Charge or IUC is a cost paid by one mobile telecom operator to another, when its customers make outgoing mobile calls to the other operator’s customers. These calls between two different networks are known as mobile off-net calls.
IUC charges are fixed by Telecom Regulatory Authority of India (TRAI).
IUC came into limelight when JIO started charging 6 paisa per minute charges to customers making off-net calls.