Possible to find out blocked numbers?

[zindan]

Hello. 

Say you get called up by a blocked number and threatened by a coward and wish to find out what his number is, would that be hard to do ? 
Is it possible? 

What kind of knowledge would be required to do this on your own, not just finding out who the number belongs to but also tracing it? 

Does this require a lot of difficult tech and or knowledge like math/physics and stufF? 

[Spotty]

3 minutes ago, zindan said:

What kind of knowledge would be required to do this on your own, not just finding out who the number belongs to but also tracing it? 

Does this require a lot of difficult tech and or knowledge like math/physics and stufF? 

Life isn't the movie Hackers. This is demonstrated by mid-1990s Angelina Jolie not being my girlfriend.

If you are receiving threatening phone calls; contact the police and make a report. The police will be able to access the information from the phone companies and proceed accordingly.

[zindan]

Just now, Spotty said:

Life isn't the movie Hackers. This is demonstrated by mid-1990s Angelina Jolie not being my girlfriend.

If you are receiving threatening phone calls; contact the police and make a report. The police will be able to access the information from the phone companies and proceed accordingly.

I am not, and if I were the police wouldn't be able to do a thing. 

You have not answered my question, I asked about the difficulty level. 

But you claim it is possible if  the police does it. 

Thank you for your reply but I am not interested in where to go. I simply wish to know what I asked, if anyone has that knowledge then please share. 

Thank you

[zindan]

3 minutes ago, VegetableStu said:

I'd imagine that's on the telco ._. caller ID is something provided by the telco, and if the caller has set up a no-display for their associated number then you'd won't be given anything (save for listening if he sounds suspiciously like Bob.)

 

note the time of the call and contact your mobile provider. if it's a death threat (however funny it sounds from their end) make a police report.

So if a person would like to find out on his own he would have to go through telco? (I am assuming telco means the telephone company  )

[ItsTheDuckAgain]

3 minutes ago, Spotty said:

This is demonstrated by mid-1990s Angelina Jolie not being my girlfriend.

because she was mine!

 

10 minutes ago, zindan said:

Does this require a lot of difficult tech and or knowledge like math/physics and stufF?

yep. Like in the movie hackers. You need a custom fancy looking linux gui that does pretty much nothing besides showing progress bars that get slower in the end while the tension rises.

 

On topic:

In the old days blocked numbers have been just flagged as such so the receiving device didn't display the number but it was actually there. That changed somehow in the early 2000s. As far as I know, it now gets blocked on the phone companies end and you actually can't extract it anymore. So in order to get the number, apply for a job at said phone company and extract the number there...

[Spotty]

9 minutes ago, zindan said:

So if a person would like to find out on his own he would have to go through telco? (I am assuming telco means the telephone company  )

The telecommunications company cannot provide you with another persons personal information.

If you report a nuisance or harassing (non threatening) phone calls to your telecommunications provider and report the dates and times that the calls were received, they can put a block on the number(s) and stop that number from being able to contact your service. 

If you continue receiving nuisance phone calls after that step, follow the same process again with your telecommunications provider to block the new numbers, and I'd recommend also filing a police report with the same information you provided your telecommunications company (date/time of the phone calls, the nature of the phone call and what, if anything, was said).

[voiha]

Your phone operator can see who was it. But they won't give you the information if you don't have a police permission to do so *or you don't know someone who works there*.

Other than that it's kinda not possible to see who was it as the info is on the caller end and stored in the database (which is not on your phone).