Double click on the BT Internet icon form desktop. In the 'Connecting to BT internet window, click on the 'Configure' button and select 'Configure Modem Lock (Modem Protection)' tab from the drop down menu.
This wil open up the 'BT Modem Lock Configuration' window.
Here, untick the option 'Enable BT Modem Lock for modem protection '(recommended)'
Click on 'Apply' and click on 'OK'
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