This created one of the few area codes in the nation that is not contiguous, as 865 is almost entirely surrounded by 423 except on the east. Although this seemed to be a temporary solution, the North American Numbering Plan Administrator initially determined that the reconfigured 423 would not be exhausted until around 2010.
The creation of area code 865 led to one of the few areas in the country without contiguous numbering, with 865 almost entirely surrounded by 423 except for its eastern border. This arrangement was initially seen as a temporary fix, but the North American Numbering Plan Administrator determined that the reconfigured 423 would not be exhausted until around 2010.