You can keep your number if you move. My number is from another state.
Also nowadays when you get a new line you can pick any area code, so they have become somewhat meaningless.
I wouldn't go that far. Area codes don't mean as much as they used to, but they are still a very strong association to the actual area. I would say that the majority of people I interact with in my area have a mobile number from the area code. And of those who don't, all of them are from out of state.
