Sun Life Financial Customer Service Phone Numbers Sun Life Financial Customer Service: 1-800-361-6212 Customer Service: 1-800-669-7921 Sun Life Financial Credit card support Numbers: 1-877-786-5433   Sun Life Financial Headquarters Info, Email, Phone number, Website and live chat Information The Sun Life Financial is a Canada-based financial services company known primarily as a life insurance company. It is one of the largest life insurance companies in the