Change platform: Computer help If you're having trouble with logging in to your account from the Find your account page, try these tips: Ask one of your Facebook friends to look at the About section of your profile and send you the email address or mobile phone number listed in the Contact information section. Try entering each email address or mobile phone number that you've owned one at a time. You may have added an old email address or mobile number to your account and forgotten about it.

In other words, my list has gone from 10 billion choices to about a thousand in just a few minutes of work.

Step 4: Brute-Force It the Smart Way At this point, a hacker could just start throwing numbers into the Facebook search bar, but that still wouldn't be that efficient. So what does a lazy hacker do? They take advantage of a Facebook feature that allows you to conduct a bracket search. Facebook allows you to upload lists of contacts in CSV format, and then tells you if they are on Facebook so you can add them as friends.

By constructing my own contact list of potential numbers, I can here rule out large chunks of wrong numbers. In this case, I know the number has to be in the range from to By cutting that in half and creating a list of numbers from toI can effectively rule out half of my list, as the target will only be in one of the two half lists created. Then, I can upload the list and instantly determine if they are on it or not. From there, a hacker can open the file in Google Sheets or Excel and change the column formula for the phone numbers to one that will iterate over the numbers they need to check, as seen in the following example.

In the excel formula below, I start by taking the lowest value phone number, in this case,then How to find facebook account with phone number add 10, to it in order to increase the fifth place digit by 1. This formula will repeat as many times as needed, but we shouldn't do it more than 1, times because there are only a thousand numbers in our list to guess.

If the target hadn't had a PayPal account to help us here the third and fourth place digit, then we would be adding to increase the third digit instead.

Click on the Gmail logo and then "Find Friends. After it's uploaded, Facebook presents the hacker a list of "Friends" to add from the list. They would then search for their target inside that list. My target doesn't seem to be here, so I know they aren't in this half of our batch of numbers. Next, instead of testing the nextI split the next in half and check one of those halves.

This is because I already know the target will be on the second list since they weren't in the first half. The hacker can continue searching in this way until the target appears on a phone number list.

From there on out, the hacker would test smaller and smaller batches of numbers until they have only a handful to test. I stopped when I had it down to about 30 numbers. Obviously, this see more take longer if the hacker has less information about the other digits of the phone number to begin with, as they will have a larger number set to search.

Facebook will rate-limit the hacker to five attempts per day but they can get around this by signing into another account. Step 5: Test the Last Few Numbers Once that hacker has it down to a handful of numbers, they can go to the Facebook search bar and type them in one by one. To do so, just type the number into the search bar with no hyphens.

However, that's not how to find facebook account with phone number of a defense when the hacker only has 30 numbers to check. In total, it took me around 30 minutes to an hour to find the target's number, and these same steps could be used on anyone who has their phone connected to Facebook. Signaling System Number 7, or SS7 in short, is a telephony signaling protocol that over telecom operators worldwide use to exchange information with one another. Information such as cross-carrier billing, roaming ability, and other features all work through SS7. However, an issue with the SS7 network is that it trusts all messages it receives without checking their origin.

So, malicious hackers could potentially trick SS7 into diverting text messages and calls to their personal devices. SS7 has been known to be vulnerable for years, despite it being the most advanced encryption used by cellular networks. The design flaws in SS7 have been circulating sincewhen the researchers at German Security Research Labs brought them to light. Then, Facebook will ask for the email address or phone number linked to the target account.

After that, the attacker can now use their skills to divert the SMS containing a one-time passcode OTP to their own computer or phone.

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