Interconnect Usage Charge (IUC)

Imagine two rival postal services that still have to deliver each other's letters to addresses only the other company serves, and needing an agreed fee for that delivery, since one company handing off mail to a competitor's network for final delivery is providing a genuine service that competitor should compensate for. Interconnect Usage Charge is exactly this compensation mechanism for phone calls crossing between different telecom networks.

Whenever a customer on one network calls a customer on a different network, the calling network historically paid the receiving network a per-minute Interconnect Usage Charge, since the receiving network incurs a real cost carrying and terminating that call on its own infrastructure. TRAI set and periodically revised this charge, and its level had genuinely significant competitive consequences.

This became a major flashpoint when Reliance Jio launched in 2016 with free voice calling as part of its aggressive market entry strategy, since Jio, as the network receiving a disproportionate share of incoming calls from incumbent operators' subscribers switching to its free voice model, argued the prevailing IUC unfairly burdened new entrants, while incumbents argued the charge fairly compensated the real cost of terminating those calls on their networks.

TRAI progressively reduced the IUC through this period and finally cut it to zero in January 2020, moving India to what is called a bill-and-keep system, where each network simply absorbs the cost of terminating calls from other networks without a per-minute payment changing hands at all, a structural change that removed what had been a genuinely contentious inter-operator cost entirely.

Whenever India's early 2010s telecom price wars are discussed, particularly Jio's disruptive free-calling launch strategy, IUC was one of the central regulatory battlegrounds underneath that commercial fight, a per-minute fee whose level directly shaped how aggressively a new entrant could actually price against established incumbents.