When i try to sign up for phone in they only have certain area codes, is that it in the drop down box?

im trying to setup a number with my current area code but they do not have mine listed, what do i do for that. when will they upgrade the list, i also noticed certain countries listed , are they going to expand the countries you can select to have your phone in #. i am interested in the 757 area code and also china for countries.When i try to sign up for phone in they only have certain area codes, is that it in the drop down box?
i guess wait until they get the area code in their system since that's the one that you want really bad.