A lot of people find themselves in a problematic state to find where a caller is originated from or to determine if their girlfriend is cheating on them. To find whose phone number belong to, reverse phone look up is a painless way check if your lover is cheating on you. When you hunt for the term 'reverse phone' in your search engine, you will see web sites and services that provide a solution without any charge in their advertising. The truth is, many of these reverse phone lookup services are scam. So what you should know to really do reverse phone lookups for free?