I’ve written before about how poor the Vodafone 3G Mobile Connect client is, and the alternative in Windows. However, it’s also worth mentioning that the card itself is far from perfect. It is very sensitive to the position of the SIM Card - having it off by even a few millimetres can mean it doesn’t connect, and it’s not always obvious what is wrong. The crucial thing is to have it poking out of the top, but only by half a millimetre or so. Don’t push it in all the way! This photo shows what it should look like:
It’s a shame Vodafone themselves don’t bother making this clear. This wasted about an hour of my time when I first got the card.