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You should never deactivate the PIN protection on your SIM card. If the PIN is deactivated, authorities or other people can use the card themselves to gain access to messengers, for example.

More information

If your SIM card is not protected with a PIN, other people can theoretically remove it from your phone and insert it into another phone. They could then try to access your accounts that use the phone number on your SIM card. A pin protects against this very effectively.

This attack is similar to SIM swapping. In this case, people trick your provider into sending them a copy of your SIM card using your personal data.

Particularly important for the following target groups:

Sources and further links

  1. SIM swap scam, wikipedia.org, (en)