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I believe its unlimited. You can use as much as you want, no charge. This is the £10 goody bag with following.
Ultd web - (Use it as much as you want.)
Free to gg
It's exactly as it says on the tin, however don't take the proverbial (i.e. use your phone as a modem to stream movies and channels etc) else you will annoy the mighty GiffGaff Giant and feel his wrath.....
It is unlimitited but there are a couple of rules like no theathering (using mobile broadband to stream to a tv or for downloading on a pc etc)