The customer service phone number for America First Credit Union (AFCU) is 1-800-999-3961. This is the main contact number to reach their customer service department. The number is available on weekdays from 8:00 a.m. to 7:00 p.m. and on Saturdays from 8:00 a.m. to 5:00 p.m. However, the AFCU's customer service is closed on Sundays.