It used to be much harder to obtain a persons cellular phone number, the laws were a lot stricter. However, recent changes in the law will allow you to now be able to get that persons cell phone number, but you will need to get help from one of these web sites. That is, unless you can find the persons number by typing their name in to a search engine. This may be possible, but it is not probable. If you can't find the number yourself then a cellular phone directory will be your best bet to being able to find cellphone numbers.