Many people find themselves trying to verify where a caller is from or to find out if their partner is betraying them. Reverse phone lookup is a painless way to go. When you hunt for word 'reverse phone' on yahoo for example, you will see sites and services that offer a solution without any charge in their advertising. The truth is, many of these phone services are bunch of harkers who will harm your computer. So what you should know to actually get these services for free?