By turning your business card into a magnet. The flat, flexible business card-sized magnets are great for temporarily attaching a child's artwork, baseball team schedules, cartoons, and just about anything else to most metal surfaces. And that makes them a great tool for keeping your business name and phone number where your customers can see the information frequently. They work particularly well for consumer services where there is a lot of competition such as pizza parlors, insurance agents, drug stores, and appliance repair.
You can order magnets from any advertising specialty company or from your local printer. Depending on the style and the quantity ordered, you'll pay 60 cents to a dollar per magnet, but the repeat calls down the road are worth the investment.