To find out who called your cell phone, you will need to perform a reverse cell phone lookup. Since these lookup services allow you to find such information as name, address, line details and carrier details for any number, you can easily find what information you need in order to establish who called. This allows you to find out information for numbers including cell phone numbers, land line numbers, toll free numbers and unlisted numbers. Because the company behind the lookup tool is privately owned, they have to pay for several licenses to allow them to collect the data that they have. This means that you can easily find out information in a 100% legal and confidential way, allowing you to not fear loegal reprisals, etc.