Do you need help logging in to your Comcast account? Comcast login errors are generally caused because of invalid login credentials or because of server errors. However, no matter what sort of error you may encounter while using Comcast, you should know that help is just a phone call away. You can call the Comcast customer support phone number and speak to a trained software expert to get a step-by-step guide to resolve any error code on your Comcast account. The helpline number is available 24 hours a day so that you can be sure to get a response exactly when you need.