actually you get banned from buying the £20 goodybag on giffgaff if you use past 12GB in short time (week or 2) or over 20GB in past 30 days (not Per goodybag) so you should text PLAN to 43430 to make sure you not over 15GB
customers of giffgaff are still getting banned for using lots of data at night now, as the 3G unlimited goodybag hidden Ban FUP is applicable to the new £20 4G always on "ish" goodybag (this is on top of the 6GB high speed cap 256kbs between 8am-midnight, full speed between midnight and 8am)
data speeds are still an issue on giffgaff, giffgaff cant provide more then under 0kbs-300kbs to under 2mb (depends how lucky you are) between 11am-midnight due to giffgaff is only buying enough capacity to just about 300kbs at times (with upload speeds of 13-20mb on 4G),
but once january 3th passes when there next new recured after that date any one on a 3G goodybag will be on the 6GB capped one (the amount of complaints we get this month and past february 13th will be interesting),
giffgaff are removing the unlimited ish 3G goodybag to make people leave who use lots of data (really think they should of done it right away, they ignored the idea to impose high speed capping at 10GB (500kbs and 12GB 128kbs)