If you live in Indiana's 812 telephone area code - that's us in Jefferson and Switzerland counties - and have not started using ten digits, rather than seven, to make local phone calls, now is the time to get in the habit.

The "permissive dialing" or grace period in which local calls made with either seven or ten digits will work is more than halfway complete. The six-month transition period is designed to give consumers ample time to adjust to the changes.

Starting Sept. 6, homes and businesses with 812 telephone numbers will be required to use ten-digit dialing for all local calls. If you forget and do not use the new dialing procedures after that date, your call will not be completed and a recording will instruct you to hang up and dial again.

The change in dialing patterns is necessary for the introduction of the new 930 area code, which will be implemented this fall. The new code is being added through the "overlay" method, which has been used for all new area code additions in the United States since 2008.

An overlay is the addition of another area code (930) to the same geographic region as an existing area code (812). An overlay does not require customers to change their existing phone numbers.

The new area code is being implemented due to projections that all numbering supplies for 812 will be exhausted in 2015. To ensure a continuing supply of telephone numbers, the new 930 area code will be added to the entire 812 region which has covered southern, south-central, and parts of west-central Indiana since 1947. The Indiana Utility Regulatory Commission (IURC) ordered the overlay in July 2013, following a year-long study.

Starting Oct. 6, new telephone lines or services may be assigned numbers using the new 930 area code. In some cases, a customer with an 812 landline number who moves to a new location may be assigned a 930 number.