Many people become frustrated when they receive unidentified phone calls and cannot figure out who they are from.
Whenever a cellular phone call is received, the caller ID will either, pop up with a person's name, show that it is a mobile phone call, or show the name of the person's carrier.
There are ways that you can find out who it is that is calling you, like reverse cellular phone number searches.
You can normally find non cell phone numbers for no charge on the internet.
Any number that is not for a cellular telephone is public information, and for these you can either use a phone book or any computer with internet access.
You can attempt to look up cell phone numbers for free, but that is probably the worst way to go.
Remember cellular phone numbers are private information, and are owned by the vast array of mobile phone companies like Verizon, Sprint, AT&T, etc.
They most definitely would not allow the public access to these databases for no charge.
There are companies that offer services for you to do a reverse cell phone number search for a small fee.
These companies pay cell phone carriers to be able to access their private information.
Then they turn around and charge consumers to look through the databases for whatever number they may need.
The time that is saved from attempting to trace a number using cost-free means is well worth the low price paid to look in the databases.