Recently people have been using popular services online to lookup the information of other cell phone users. It has become a great way to spy on your significant other and see who they have been talking to. The hang up though is that a large number of these online services are thinly veiled scams to collect your information and spam you like there is no tomorrow. So which sites are the trustworthy ones? Well the simple answer to this is that the only sites you can trust are the ones you have to pay for. Currently there is no free directory of cell phone numbers available online. You can find free information about people that use landlines online, but reverse cell phone lookup requires more work because that data has to be accessed manually through different databases. I see this becoming a common service in the near future though and will eventually be free. What do you think of this service? Useful or intrusive?