It was supposed to begin September 6, 2014.
It's a result of adding a new area code in Southern Indiana.
It would require callers to dial ten digits to make all calls with the the existing 812 area code and the new 930 area code, but the State Utility Regulatory Commission has postponed it indefinitely.
Officials said the medical and law enforcement sectors expressed concerns to phone companies about the new dialing process.
As a result, until further notice, seven digit dialing for local calls remains in effect.