The usual scenario would be, you're busy doing stuff and your phone is left unattended or it is off.
During that time there were several calls and there was no one to answer it.
After you're done with whatever you're doing you realize your cell phone has missed calls, a lot.
And there's those words again you always hear yourself saying, "This phone number belongs to whom?" So, you try to call the number but this time no one's answering.
It might be some important client that has some deals you wouldn't want to miss.
Well, here's a list of what you can do so you'll not waste time waiting for that number to call again and pondering who could have called.

• Open another browser window and type the number into Yahoo or Google search field.
  Use quotation marks.
  If you're lucky, you'll find out who the owner is.
  But with this you'll usually be left empty handed.
  If this does not work proceed.
  
• Go to a quality phone number lookup service.
  Don't be fooled by so called "free" services like this that offer to help you find who a phone number belongs to.
  They're usually just scams.
  All of them lead to paid services, some which try and get you into recurring billing plans.
  Go for those services that ask for a small fee, I guarantee you they'll not ask for more than $15 for a single search.
  
• Put the number in their search field.
  The search field of these services is much like what Yahoo and Google has.
  Its a box to enter the number and a search button.
  Once entered (no need for quotes this time) click the search button.
  
• In just a moment you'll get the preliminary results.
  You won't be waiting long, I promise.
  If the initial search shows they have the information you need decide if you really want the data.
  If so, choose your plan.
  
• Check out and in seconds you will have the scoop on the mystery number.
  The results are so helpful that you won't regret following these steps.
  You'll get the name of the owner, his address, a map to that address, his cell phone company and any other data they have available.
  

I think I can hear you saying, "Really? Just 5 steps to answering whose phone number is this?" Well, my answer would be a big "Yes!" That's how easy it is to know the detailed information of an unknown number these days.
We've come to the era where everything is just seconds away.
If you do have a lot of nameless numbers stored in your phone, it would be best that you opt for annual plans so you can readily and easily know for each who the phone number belongs to.
This is more economical than spending $15 for a one time search.
A lot could happen in one year, prank calls happen from time to time and you would want to be free from that.
Also, your daughter might be talking to someone you really don't trust.
It's best to have this service available for you at anytime.