Enter your (UK only) mobile number below and hit Check to find out if your phone number
appears in the leak of 11,522,326 UK Facebook user's details.
+44
Your number does not appear in the leaked data.
Your number does appear in the leaked data. Other data may be associated with this leak - your full name,
location, occupation and date of birth could also have been included. Be extra wary of phone calls, texts or
emails from people who seem to know information about you as scammers will use this data to make them seem more
legitimate.
Could not check number - please ensure you have entered a valid UK mobile phone number.
FAQs
The data appears to have come from a 2019 leak from Facebook. If you don't remember that leak, that's
probably because it doesn't appear that Facebook notified affected users at the time. The leak comprises the
data of over 533 million users, of which over 11 million are from the UK. This data has previously been for
sale on
hacker forums, but on the 3rd of April 2021 it was released for free, which hugely increases the number of
people who have access to this data. This site checks if your phone number was included in that leak if
you have a UK mobile number. The fact that it is "old" data is not a mitigating factor when the data
includes information that does not frequently (or ever) change, like your phone number or date of birth.
The data that was leaked is messy and incomplete in many cases. If your phone number was leaked, some or
all of the following data may have leaked alongside it: your full name, your location, your job and where
you work, and your date of birth. In a small number of cases, the email address you use for Facebook may
also be included.
This site doesn't collect or store your phone number. It performs a process called "hashing" where it
generates a mathematical representation of your number and checks for the presence or absence of that in the
leaked data. Your actual phone number is not recoverable from the hashed version.
The main thing is to be more vigilant and alert to texts or phone calls that could be scams. Scammers will
inevitably use this data to personalise texts or calls in an attempt to make you fall for them. If you get a
call or text from someone who knows information about you, remember that the information could simply have
been taken from this leak.