I have an idea as an new product giffgaff can look towards, mobile broadband.
many other networks provide this, such as "T-Mobile" "3" "vodafone" including "02", I'm not sure 100% how it would work but since giffgaff uses 02's network, I'm guessing that it could be possible to use their broadband network too maybe. Or since giffgaff provides Internet for your mobile would it be possible to use the same MB in a dongle form? excuse me if thats a really silly thing to think and it dousent work like that at all. But I think mobile broadband is defiantly a realistic possibility for giffgaff.
since mobile broadband works on a dongle, I'm thinking giffgaff can give dongles, just like the sims, and in the same way as the sims people can top-up and pay online perhaps. And if giffgaff can offer the great deals on mobile broadband, just like the great deals for mobiles, it would be great and appeal to everyone who uses the Internet. I'm sure current giffgaff users would be the first to be interested knowing that giffgaffs the cheapest network around, that is if giffgaff could also be the cheapest mobile broadband around. So viceversa anyone looking for cheap broadband and going with giffgaff would probably want to join giffgaff as thier phone network aswell. So it would bring many more giffgaffers!
I'm not sure how complicated this would be to set up, but I defiantly think it should be considered.