What is IMSI catcher? How it works?

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What is IMSI catcher? How it work

• IMSI are international mobile subscriber identify is a unique digit number used for authentication of a person moving network to network.

•The number is stored in the read only section of a SIM card and with a mobile operator IMSI catchers are devices that are presumably used by government agencies to wiretap the mobile phones of people under surveillance .

• You might be thinking why should we worried about it right? 
It is because not only government but Also some hackers make use of it.

•IMSI catchers are devices that act like fake call towers which trick a target's device to connect to them .
All the communication such as calls message, internet traffic, etc. Can be collected and read.
The interesting part is for victim it seems like everything is working normally.
In the cyber world it's also known as Man In The Middle Attack.

You might thinking how can be a IMSI catcher trick your device. Basically there is a loophole in the GSM protocol i.e mobile phones always connect to the strongest signal if you are within the range of IMSI catcher and your phone is on you can't do anything to prevent it form connecting to the fake tower .

These fake towers access points generally sniff IMSI suggested to disable to WiFi calling feature.
WiFi calling is based on the identities such as IMSI numbers which are protected by a certificate leading to MITM atttack.

And the main thing is don't confuse the IMSI number with IMEI number.

IMSI is tied to a user SIM while IMEI is  unique device id  whenever you enter a new SIM in your phone a message is sent. It is nothing but your IMSI number.

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