I agree with Krystle's comment.
Area codes are subject to change based upon population of a given area, in fact that area's numbering system underwent reassignment not even ten years ago.
If you tire of this design, I'm sure a competent artist will be able to do a decent cover up job although you may have to go with a great deal of blackwork. Just make sure to do a fair amount of research into the artist's previous work by examining their portfolio and speaking with them personally. Good luck.