You can call the U.S. CBP INFO Center for any type of information related to crossing the border. Their phone number is (877) 227-5511 or (202) 325-8000 from outside the U.S. The call center is open Monday-Friday between 9 a.m. and 12 p.m. and then again from 1 p.m. to 4 p.m. Eastern time. You can also email your question to the CBP using a ....