The Online Family answers:

Take a look at your latest bill from your service provider -- what does it suggest? Many companies will direct you to their web site if that's the easiest way for you to solve problems or get answers to frequently asked questions. For example, many major telephone companies allow you to use their web sites to add or remove features from your plan or to book a service appointment for your home. Or if you want to know about your power company's rebate programs, its web site probably has all the information, along with any forms you need to fill out. However, for detailed issues or complaints, or to cancel or transfer your account, you might be better off calling the customer service line so you can explain your situation clearly.