If you need to speak to Frontier customer service, there are a few steps you can follow to get in touch with a representative. First, you'll need to dial Frontier's customer service phone number, which is 1-800-921-8101. Once you've dialed the number, you'll hear an automated menu that will guide you through the process of selecting the option that best matches the reason for your call. Depending on the reason for your call, you may need to provide your account number or other identifying information to the system. After you've selected the appropriate option, you should be connected with a Frontier customer service representative who can assist you with your issue.