All Area Codes Now National?

People who move to places served by different area codes are increasingly keeping their old mobile numbers, with their old area codes -- whether they're moving across the region or completely across the country. With national calling plans and flat rate long distance plans, why not?

Area codes may thus grow into an indicator of where you're from, moreso than where you are.

My migrations, in area codes:

212 201 713 415/510 408 512 415