Consumer Reports is one of my favorite personal-finance magazines, and for a variety of reasons. Not only does it help readers find quality products at great prices, but it also gives tips for saving money by changing behavior. Even the CR letter column is great!

For example, in the most recent issue (March 2009), there’s a letter from Richard Guibilo that offers a tip for saving money on cell phones:

Your January report “Best Cell-Phone Service” should have advised readers to ask about discounts based on the company they work for. Most cell-phone carriers offer a cooperative discount to employees of a variety of companies. When I discovered this, I switched carriers and got a 20 percent discount on my calling plan and a deal on two cell phones, all without having to mail in any rebates.

Intrigued by this tip, I searched the websites of five major U.S. cellular carriers to find their corporate discount programs:

To verify eligibility, these websites will ask you to enter your e-mail address. If your employer (or school, in some cases) qualifies, you may receive discounted plans or equipment. It’s a quick and easy way to reduce recurring montly costs!