What do you do when an area code 'fills up'? When all the exchange codes (the second
set of three digits) within an area code (the first set of three digits) are all used
and the supply is exhausted?
The primary options are to SPLIT the area into two or more areas, each with it's own
code, or to OVERLAY a second number on top of the first.
317 was expected to need relief again by the 3rd Quarter of 2002 (that has now been extended
until 2006), Indiana's last added code 765 is expected to need relief by the 3rd Quarter of
2004. (765 split from 317 in 1997.) 812 is expected to need its first relief ever by the
4th Quarter of 2004.
It is my hope that 317 will recieve an overlay, (NPA 463 is possible), 765 will split
three ways (NPA 547 is possible), and 812 will split into two (NPA 930 is possible).
317 should be a near "no brainer". When the new 317 area was designed back in 1997 they
started with an area where every call was local to downtown Indianapolis. The most obvious
answer for 317's exhaust in 2002 is an overlay. Performing a split of such a small area
just isn't logical. The only "logical" split line would be a donut arrangement where 317
would become JUST the Indianapolis rate center. However many wireless numbers are centered
on Indianapolis, and that rate center itself would require further relief in record time.
I look for an overlay (463 poss.) on 317.
The industry has recommended an overlay for 317, with 10D dialing to all local numbers,
11D required for long distance, and 11D permitted to any NANPA number. 7D will no longer
be permitted within 317.
The current 765 is another large area similar to 219. I look for a split. I expect a
three way split in order to give the longest life, although the general difficulty is
population distribution. 765 is mostly rural.
No area code lasts forever. 812 was one of the original codes, the only original code
left without major change in Indiana. This is an area with several "metro centers" and
a lot of rural areas. Figuring out how to group the five main centers into two or three
area codes should be interesting. Again, due to the large area I expect a split.
The industry has recommended an overlay for each of the three area codes in question.
has already been submitted to the IURC.