Giffgaff do not have a fair-usage-policy on their "unlimited data", as many of you will know, and have been known to boast that with giffgaff unlimited really means unlimited.
Having recently learned that it doesn't, my suggestion is that giffgaff stops claiming that it does, and put a number to the data usage limit.
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This has been suggested a few times recently and duplicate to this idea
http://community.giffgaff.com/t5/Submit-Great-giff