Clear communication is essential in customer service – you need to know what the customer wants, and be able to articulate what you can do for the customer. Enunciating, speaking loudly enough, and employing an upbeat tone, will help you communicate clearly and positively with your customers. These skills are essential in phone communication as well. If you write or email with customers, be sure to use proper grammar and spelling, and choose words and phrases that convey a similarly upbeat attitude. Here's a list of communication skills.