From time to time we vary the area code for our sim cards. In any case, it doesn't matter what area code your USA mobile phone sim card comes with - it can be used anywhere in the USA.
If you'd like, we can allocate you an area code for a specific USA city. Once you order your sim card, send an email to help@usaprepaidsimcard.com.au and tell us the zip code of the city in which you'd like your area code.