Area Codes

Today I happened to call two people in Annapolis, Maryland, who worked in the same office in the same building. I thought they did, but they had different area codes, so I asked, suspecting that one perhaps had a home office or cell phone.
It turned out that, when faced with a new area code recently, the metro Annapolis part of Maryland chose to have to the new and the old area codes overlap, an "opportunity" offered to New Mexico with the appearance of the 575 area code. The result, the woman in Annapolis said, is confusion and a general pain in the neck. By keeping the area codes geographically separate, New Mexico made the correct choice.