In reply to skog:
> If you do that, it works as PAYG - which I think may be what you want. Their rates are quite good; they show them under Our Offer - Prices.
> Relevant to you: "Mobile Internet (up to 20MB) 20p per day"
> You can do this -and- have a goodybag or gigabag if you need, so, say you want PAYG but have a month you know you'll be using it lots, keep it in credit and buy the relevant bag just for that month.
> If you go over your limits with a bag, it starts coming out of your credit total (so, back to PAYG).
> If your credit runs out and you don't have an active bag, you can't use it until you top up or buy a bag - you can't spend what you don't have on it.
> It's kind of a hybrid - PAYG, with the option to add mini-contracts on top as and when you want.
Think I understand that now. I can get a card from Giffgaff without necessarily paying a set amount each month but just use the card as a PAYG by topping up when it suits me.