What is the customer service number for fidelity? The customer support phone number of Fidelity Advisor is +1 877-208-0098 / 800-642-4585 (Click phone number to call).What is fidelity 800 number? The customer support phone number of Fidelity Investments Contact is +1(800)-343-354, 8800-544-6666, 800-544-6666 (Click phone number to call).What is fidelity help phone number? The customer support phone number of Advisor.fidelity.com is 877-297-2952 / 877-208-0098 (Click phone number to call).What is fidelity investments phone number? Phone Number of Fidelity Investments is 800-544-6666 . Fidelity investments is a financial service industry that deals in finance and mutual product. It has 38,000 employees.