Updating your contact information with the National Visa Center is an important step to ensure you receive all necessary communications about your case. According to the National Visa Center, applicants can update their information by submitting a request. Generally, you will need to provide your case number along with the new contact details, such as your new telephone number or mailing address. This can often be done through the appropriate online form available on their official website. It is advisable to check the current web page for detailed instructions and any specific requirements for submitting your request. Remember, keeping your information current is vital for a smooth process with your immigration case.