A static phone number is a single, unique phone number. They’re generally used for offline marketing collateral, such as direct mail, brochures, business cards, out-of home advertising, as well as events, and radio and television campaigns. They allow you to track the number of phone calls you receive from all your offline marketing activity, and monitor the return on investment from these channels. They can also be used on your pay per click adverts as the click-to-call number, so you can still track the conversions from your PPC ads – even if the caller doesn’t click on them. Static phone numbers are easy to use. The key to using them effectively is to make sure you use a different number for each marketing activity.