Actually, don’t be surprised if they never answer the phone.
Via Post Mail National Visa Center Attn: WC 31 Rochester Avenue, Suite 200 Portsmouth, NH 03801-2915 You may want to use more than once method to make sure the NVC receives your updated information.
In case method (2) is being used, the NVC will not receive the petition at all if the Adjustment of Status application (Form I-485) is filed concurrently with the petition.
If, however, the petition is filed as a standalone petition, the NVC may contact the beneficiary, and the beneficiary must indicate to the NVC in response that he or she is adjusting status and does not intend to apply for a visa.
It is used by people currently unlawfully present in the United States prior to departing the United States for a consular interview.