Vodafone Mobile Connect - Incorrect Pin code
As I usually use my SIM card in my iPhone, I booted my PC, plugged in the Vodafone USB Mobile Connect modem (HAUWEI 220 or something). I then inserted, with the USB device plugged in, my SIM card, and booted up the Mac (and later on Windows) Vodafone application, to connect my PC to the Proximus 3G network.
This resulted in a constant error; “The pin code was not accepted by the mobile device”.