U.S. Citizenship and Immigration Services can be reached by telephone at 1 (800) 375-5283 or at (212)-620-3418 for callers outside of the United States. The office can also be reached at their TTY line, 1 (800) 767-1833, according to the Department of Homeland Security website.
Customers calling U.S. Citizenship and Immigration Services (UCIS) will be able to get assistance with pending applications, perform a change of address and check their case status, according to the website. When emergencies arise, customers are able to call UCIS in order to reschedule. Automated and live assistance is available via telephone. The hours of operation vary depending on the customer's calling location.