Does an official mobile phone directory exist? Unfortunately, the answer is no...a mobile phone directory does not exist. This does not mean you cannot type in a person's name into Google or another favorite search engine, hit Enter, and find out cell phone information related to that person. If, for example, a person had placed an online ad or posted a Facebook or MySpace page where they included their mobile phone number, you will strike pay dirt. Of course, how much information you receive depends on how much other information they provided. But it's certainly worth a try.

Plus there are some volunteer mobile phone directories where people have deliberately posted their cell phone numbers, but most people have not done that nor will most people be likely to. After all, who needs to be called by telemarketers.

Even a proposed joint cell phone directory the development of which has been endorsed by the major mobile phone carriers will require that cell phone users opt in, and it will not be published like a regular telephone book. Indeed, it may not even be posted online.

So what does someone do when they want to find someone's cell phone number? Well, the first thing to do...if searching does not work...is to actually ask the person for their phone number! It's far and away the easiest way to get someone's mobile phone number. If they do not want to give it to you, then you should probably respect that and stop asking. On the other hand, you may have a genuine reason for looking. If so, ask a mutual friend.

If that's not an option and you have a reason considered legitimate by the Driver's Privacy Protection Act (DPPA), contact the Department of Motor Vehicles in the state where the person lives and make a formal request. That's simply a matter of filling out a form, swearing to the legitimacy for your request, and paying a small fee. The person's phone number should be part of their DMV record.

Or you could always hire a private investigator. This is an expensive option, but it is likely to be successful in finding a person's mobile phone number.

A ringtone is a sound file that is played by a cellular or a mobile phone. The purpose of ringtones is to give a unique ring to a cell phone so that it can be distinguished in an environment that has lots of cell phone users.

These ringtones are normally melodious in nature and are played to convey an incoming call or a message. They can be better personalized to suit ones tastes. Ringtones are the easiest way to personalize a cell phone. Many new cell phone models have features that allow users to create their own ringtones.

There are many companies that make and sell ringtones, generally through websites. The sale of ringtones has not only boosted the mobile phone sales but also the bottom lines of recording companies as a way earning of royalties.

There are three distinct types of ringtones: monophonic ringtones, polyphonic ringtones and music ringtones.

Monophonic cell phone ringtones are very simple and are compatible with most of the mobile phones in use. It comprises of a series of sequential tones at varying frequencies.

Polyphonic ringtones can be played on mobile phones which are capable of playing 16 tones simultaneously. The combination of these tones creates a harmonic melody. Polyphonic ringtones are more musical and carry better presence than a monophonic ringtone. New advanced mobile phones support polyphonic ringtones.

Music ringtones are often referred to as voice tones, realtones or true tones. They use original pieces of music along with lyrics, exactly as the original recording. The format is usually MP3, WAV, WMA, etc This feature and support for music ringtones is being built into most new models of almost all manufacturers..