To deactivate SIM cards follow the next steps.
Navigation: Self Service – Disconnect SIMs
Step 1: Choose the SIM cards to be deactivated by activating the slide bars – Disconnect Selected SIMs
Hint: By pressing the button marked in red you can invert the whole selection of cards.
A window pops up with all the data if everything is correct. If so:
Check the box I confirm that I have checked the details above – Finish