Facebook members can share a lot of information about themselves on their Facebook profiles. It might be something as general as what kind of music they like, or even something more specific, like their phone number.
How I got your phone number through Facebook
If you want to see which Facebook friends have added phone numbers to their profiles, you can do so in just a few steps. Click "Account" near the top of the screen on the right side, then click "Edit Friends. Click "Contacts" on the left side of the screen. This displays all of your Facebook friends that have phone numbers included in their profiles.
As of this writing, there is no way to search for the phone numbers of users with whom you aren't friends. My technique uses the graph search.
Most people knows that you can enter a phone number in the Graph Search to get the corresponding user:. Simply testing every number is an impossible job that would take months. I had to find a way to test thousands of phone numbers at once. I already filled in the last two digits we got in the previous step.
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Less than , possible numbers. Provider numbers are linked to the mobile phone provider:. Some provider numbers are more widely used than others. People working for the government most likely have a number, as Proximus is the state-sponsored provider. No luck for , either. I had to switch accounts at this time because Facebook only allows 20, contacts to be imported in a short timespan.
So at this moment we can add the provider number:. The last part only consists of some simple math: we have 10, possible numbers left, so if we test half of those numbers we can narrow down our pool to a handful of numbers, for example:.
The target was present in this range, so this means that the fifth number is either 0, 1, 2, 3 or 4. Testing for 50 — No luck with the — range, so we can be sure the phone number is in the — range.
Step 3. Click on the Button— Get Public Phone Numbers of your Friends.
We got numbers left, split the pool in a half so we have , , , , 81 and ultimately 40 numbers left. We can continue to do trial-and-error testing by spitting the pool in a half to 20, 10 and 5 numbers, but with less than 50 numbers left you can also test all numbers individually in the graph search. With only 40 possible phone numbers left, it is pretty easy to test all the numbers that are still in the pool.
Just enter them in the search bar until you hit the profile you were looking for.
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I informed the minister about this privacy leak. In cooperation with a local radio station we called another Belgian celebrity on air to inform him about the fact that I found his phone number through Facebook. We had a nice chat and he removed his phone number from Facebook immediately afterwards. If you liked this article, make sure to follow me on Twitter: securinti English and intidc Dutch.
How to Check for Phone Numbers in Facebook | It Still Works
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Sign in. Get started. How I got your phone number through Facebook. Inti De Ceukelaire Follow. STEP 1: The last two numbers 1 minute I had to find a way to test thousands of phone numbers at once.
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STEP 3: Narrowing down 10—15 minutes The last part only consists of some simple math: we have 10, possible numbers left, so if we test half of those numbers we can narrow down our pool to a handful of numbers, for example: 50 — STEP 4: The final countdown 1 minute With only 40 possible phone numbers left, it is pretty easy to test all the numbers that are still in the pool.
In small countries phone numbers on Facebook are easily discoverable.
How to Find a Person’s Phone Number
This is confusing and Facebook offers too little measures to prevent this. Who is affected?
Anyone in a small country that perhaps unknowingly added their phone number and did not change the default setting. It is hard to give an exact list of affected countries, but if you have a digit phone number and the list of provider numbers first two is rather limited, it should work.
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