Att sim card help I lost my sim card

Okay so i just moved about 4 days ago from miami beach to beverly hills. I have a 305 number and i really want to keep it so i can keep in touch with all my friends in miami.last night i took my sim card out of my iphone 4 and i lost it! I have no problem to go to att and spend $25 on a new sim card but do i have to change my number to the area code of beverly hills? Cause i want to keep my old miami number!

You won't have to change your number…