After doing a bit of research I relized a way to do this with T-mobile and have not tried with other carriers.
But its not that easy there is some steps you will have to complete first.After doing so you will be able to do this
right away.First Call yourself from a payphone(just incase something goes wrong)Then call T-mobile 
(backdoor number 1-877-606-4801)say to the CSR you had a death threat and need to trace the call.
They will then tell you to call your local police.You say"Aren't I supposed to give them a certin fax number? 
and what do they need to fax over?"Then the CSR says"They need to fax a signed letterhead from a supervisor 
and the time and date in question"Then they check for the number and give it to you.(fax 1-813-753-6545)
After obtaining the fax you take your ass over to efax.com and set-up a efax number.
Which is cool because you can get one in the same exchange as this number example 1-813-753-xxxx.I however 
didnt go that far.I choose not to pay.You can get a free one or even go as far as setting up a fax server but 
Im not talking about that.

Now you call your local police and say "Hello I had a person call me and they sounded BLACK and they said my 
NAME and that they were going to SLICE MY THROUT.I dont know who it is and I call my service provider 
they said I need a local police officer to send a signed letterhead from their supervisor and the time and date
in question to this number(the one you made on efax.com)Can you please help me I'm really worried about this.
"Now notice what just happened I had to tell them that a real person called me and that they said my name and 
the threat.or otherwise they won't do shit.Now wait for the fax after you get it you can send it whenever 
you want(after editing ofcourse)


It takes a little work but does work.
 

***no one try this, this is info like on tv,Im not responsable for nubians***

By Greyarea