Some cell phone providers offer unlimited mobile to mobile calls within the same network. In that case, calling a cell phone number with a different provider will cost you an extra fee. Some people may want to find a person's cell phone carrier for other reasons. No matter what the reason for doing a cell phone carrier search, there are a few online resources that you can use free of charge.
Visit a website where you can find a person's cell phone carrier, such as Fone Finder, White Pages, or 411.com (see Resources). Click "More Searches" or "Reverse Phone" if necessary.
Go to the "Mobile Carrier Lookup" or "Search for USA/Canadian Telephone Numbers" or "Reverse Phone Number" section. If prompted, use the drop-down menu to select the cell phone carrier such as Alltel Wireless, AT&T, Cellular One, Nextel, Qwest, Sprint PCS, Suncom, T-Mobile, Verizon, Virgin Mobile or other. It does not matter which cell phone carrier you choose.
Type the person's cell phone number starting with the area code. Hit the "Find" or "Search" button.
Look at the information given under "In Network" or "Telephone Company," or next to "Provider." It will tell you the person's cell phone carrier. If not familiar with the name of the company shown, click the link provided to check the cell phone carrier's website.