Sign up to receive Electronic Invoices today! Guardian customers can sign-up to get their invoices via email. You will need your customer number, the phone number on the account and a working email address. Please note that during the sign-up process you will be required to validate your email address. Guardian will send a message to your email account containing a link. By clicking on the link, Guardian will receive confirmation that your email account is able to get our email messages and complete the sign-up process. Please visit our secure website and Start the Electronic Invoice sign-up process now. Now you can pay your bill online! Guardian customers can now pay their bill online in 3 quick and easy steps. All you need is your bill and a credit card or checking account information. Payments may take 2 or 3 business days to process. Please visit our secure website and Start the payment process now. Sign up for Guardian's Automatic Payment Program today! We invite you to enroll in our convenient, "Automatic Payment Program." This Program allows you to have your periodic invoice paid automatically via transfer from your credit, debit card account, or your checking account when each payment is due. Each transaction is recorded on your monthly statement. Current Guardian customers can also use this sign up form to update their current ACH information. Click here and sign up for Automatic Payments (ACH). Customer Billing Information Customers may contact Guardian's Customer Service Center and speak to one of our representatives 8:00 AM to 6:30 PM - Monday thru Friday EST. In addition customers may e-mail service requests to Customer Service using this online form or fax us at (248) 395-1467 24 hours a day. SPECIAL NOTE: If you are a new customer, or have recently added additional services, your invoice may include Pro-Rated Charges. Guardian's service charges are billed in advance.