Live support is available at 855-747-4273, Monday through Friday from 8 a.m. to 9 p.m. CT, and on Saturday from 9 a.m. to 4 p.m. CT. You can contact First Phase at www.customerservice@firstphasecard.com to get in touch with them. You can contact US Postal Service with letter inquiries at First Phase Visa, PO Box 85130, Sioux Falls, SD 57118-5130.