John Hancock provides a variety of customer service phone numbers depending on the specific service or product you are inquiring about. Typically, the customer service numbers can be found on the official John Hancock website, where users can select their specific area of interest, such as life insurance, investments, or financial services, to get the appropriate contact information. It is important to have the details of your account or specific product handy when calling, as this may help expedite your inquiry. For the most accurate and up-to-date contact information, visiting the current web page would be advisable.