If you don't have an 800 number (or even one for each market you're involved with), you'll see your phone inquiries, leads, and sales jump higher as soon as you place those 800 numbers in your advertising.  Prospects feel more comfortable calling your number when they know it won't cost them a cent, and it also gives you more credibility as a business owner.

You can pick up an 800 number for only $2 a month and a small per-minute charge, so go through the list of available numbers and pick out the ones that make sense for your business (like 800-555-SELL).  When you find those numbers make sure you grab them -- good ones are not easy to find.