-'state' and 'areacode' together will return an array of exchanges (NXX
-prefixes), or for some exports, an array of ratecenter names.
+'state' and 'areacode' together will return an array of either:
+- exchange strings of the form "New York (212-555-XXXX)"
+- ratecenter names of the form "New York, NY"
+
+These strings are sent back to the UI and offered as options so that the user
+can choose the local calling area they like.