Does anyone here use o2 mobile broadband/giffgaff gigabag ?

Would prefer to use t-mobile or three but the closest mast to me is 02 and the giffgaff gigabag at 3gb for £12.50 doesnt seem to bad.

Wondered what the speeds and reliability were like on o2?

My mate uses the 3GB giffgaff gigabag, signal is very good and speeds between 6 and 8 mbps down and about 2.5 up but your location will vary

Never used giffgaff before -- if you buy a gigabag and then use it up do you just get booted off?

Would like it to just cut off rather than charge me, is this possible?