If you need to make a lot of phone or VOIP calls for your business to thrive, chances are, you will resort to looking for leads to call by purchasing them from companies who are offering them. You have to be careful out there; there are companies who sell their leads with promises of giving a targeted group and have your cold calls end up with wrong or non-working numbers, or worse, stale leads who opted to be included in the Do Not Call list or DNC. If unchecked, you will lose a lot of money, time, and resources from calling unwilling prospects, not to mention a dent on your reputation.