Hi Melanie,
At last, a question that I can answer to help out!!
The idea of the card is to top the card up with your available cash - for example, food shopping money. The maximum and minimum amount they let you pay onto the card varies for each company.
You can then use the card like you would a credit card but you can never go over the amount that you have on the card, and as the money is your own, you are not getting into debt.
When the card is empty, it can be topped up with cash ready to use again.
It seems useful for online purchases, as alot of people don't like using debit cards online. And also, some places do not accept Electron and Solo which seem to be the debit cards available for basic bank accounts.
There is usually a montly charge of around £4.95, but always read the small print before applying, because some pre paid credit cards charge you for withdrawing from cash machines and some may even charge a small transaction fee.
There are no credit checks for this, because there is no credit involved, it's all your own money. However, ID needs to be provided when applying.
Hope this helps [:)]