I have the old non-expiring PAYG sim in a USB dongle. The dongle is plugged into a 3G router and it all works well.
I use it as a backup for DSL, and occasionally in our caravan. I don't use it much which is why I like the non-expiring pricing.
I have noticed my balance drops when I leave the router switched on, even with no computer connected to it. I have tried selecting both the 'Connect When Required' and 'Keep Connection' options on the router. Neither setting prevents my balance from falling.
My balance dropped by 12p today, even though there is nothing connected to my router.
I have sent VF an email about this, no reply yet.
At this rate, if I left the thing on, it would cost as much as a 3G contract SIM, even if I didn't use it.
Something is not quite right.