How to email the customer? Part 2 of 3: Writing the Email Decide whether it's a complaint or appreciation email. Not all email communications with customer support have to be complaints or questions. Write a clear subject line. Make your subject line meaningful and to the point. ... Open with a greeting. ... Keep standard writing practices. ... Maintain a courteous tone. ... Identify yourself. ... Be specific. ... Ask clear questions. ... More items...Is there a customer service phone number? AT&T Customer Service Phone Number 1-800-288-2747. AT&T is a communications giant that is the largest provider of mobile phone service and home phone service.Is there a customer service telephone number for? General Customer Service: 1-877-383-4802. For faster customer service, please use the links above to contact the appropriate customer service center for your specific needs.