This is another idea that has been brought up several times in various forms (see usage-history tag), but
haven't yet made it to these pages. I feel very strongly about this and would like to promote this also here:
the idea is to implement a 'Usage history' or 'Itemized billing' under My_giffgaff on the webpage.
I prefer the 'Usage history', as i think the important aspects is that it enables one to monitor usage
(data is transferred, but of course also calls, and txt messages), not only the bill/balance at the end.
It would be a feature that underpins transparency and is very much in line with the philosophy
of giffgaff as an internet based and community oriented company.