– How to Activate a SunTrust Card? Card - Credit Card Activation Center – SunTrust credit card activation requires you to call their customer service number- 1-844-782-2737 through your registered mobile phone number. – Activate a SunTrust Card Alternatively, you can also activate your SunTrust credit card through their online portal using the details of your credit card. To follow the simple process click on the … Read more