How to check your invoice online   I already have an eCS account I do not have an eCS account   For customers who already have an eCS account, please follow the simple steps below to access your e-Bill: 1. Click "Login / Check Invoice" in the NWT homepage   2. Enter your Username and Password and click "Submit". You may also enter the 8-digit Service Number, select service and click "Submit".   3. Click the "View Invoice & Make Payment" button   4. Select the Account Number you wish to view from the pull-down menu and click "View" on the right hand side to view a particular invoice   5. Open or Save the PDF file to PC   For customers who do not have an eCS account, you must first apply for an eCS Account before you can check your invoice online. 1. Click "Apply eCS now" link in the NWT homepage   2. Fill in the required information to apply for an eCS Account     3. After you have submitted the application, you will receive an email notification and you can use your self-selected username and password to login to your eCS Account and check your invoice.