You can contact TD Ameritrade by phone. The phone number you'll need to use to contact TD Ameritrade varies depending on the purpose of your call. Here are some common numbers: For opening new accounts: 800-454-9272 For existing clients: 800-669-3900 If you need a Spanish speaking customer service representative: 888-376-4684 Account service and support are available 24/7. Technical support is also available Monday through Friday between the hours of 7 a.m. and 6 p.m. You can also contact TD Ameritrade via text to 898832, Facebook Messenger, Twitter Direct Message to @TDAmeritrade, or fax to 866-468-6268. You can send them mail, with the TD Ameritrade address varying depending whether you are opening a new account, have an existing account, or are sending overnight mail. You can also visit any of more than 175 branches nationwide to get in-person assistance.