How to remove SIM Card PIN from your GSM/UMTS modem on Debian/Ubuntu

If your GSM modem SIM Card is configured with a PIN a NetworkManager is constantly trying to ask for that PIN on every wake up… and this is quite annoying indeed. So the easy way to remove a PIN protection from your SIM Card under Ubuntu would be:

sudo apt-get install gsm-utils
sudo gsmctl -d /dev/ttyACM0 -o unlock sc all 1234
here 1234 is actually your SIM Card PIN to be removed.

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