When you need to find a telephone number for someone with a cell phone, it is somewhat different than seeking out someone that has a landline telephone. For a landline, you simply need to look inside the telephone book White Pages. Most individuals that have landline telephone numbers will have them listed in this way. This is not the case for those with wireless phone numbers. These kinds of phone numbers are not found in any telephone book; however, there are online directories. Most of these do require a fee. You can become included in an online Cell Phone Directory if you so desire. These directories are normally free and you simply have to opt in to be included in the listings. Anyone that chooses to do so will have their number listed for free. You do not have to have your number listed in this directory to be afforded the luxury of utilizing the directory to find information.Although there is information available, many people still do not know what a cell phone directory is. It is somewhat different than the average telephone book. The following are some of both the good and not so good points related to cell phone directories. One of the best features of an online cell phone directory is the fact that many are free, unlike reverse mobile look-up directories that charge a fee for their information. For those seeking mobile numbers without having to pay fees, this is a great option.Another great aspect of these free directories is the fact that they are quite simple to utilize. You simply enter the phone number and the directory will provide you the information about whom the number belongs to. To make your searches more fruitful, there are many ways you can seek the information you are looking for. You can search by the telephone number, the person’s name, any affiliations, or simply the prefix and the area code. When inside the directory, you will also be given the option to add your own number to it so that anyone trying to find you can do so, as well.One of the most major downsides to these types of directories is that they rely entirely on individuals inputting their own information in order to be included in the directory. So, unless the person that you are looking for has opted in to the specific directory you are searching, you will not find their phone number.Also, many people have come to expect a certain level of privacy by owning a mobile phone instead of a landline, and by putting your name and number into one of these online directories gives up much of that expected privacy.As more and more people switch to mobile phones over landlines, these directories will become more of the normal way of finding a telephone number. It is obvious that there is a need for this type of directory, and as more people switch to mobile phones this type of directory will become the norm.