Hi, the "Always on" goodybag is not unlimited data.
In the UK, you get 40GB at full speed, then a speed reduction between 0800 to midnight for the rest of the goodybag.
If using it outside the UK, in another EU country, you are limited to 20GB, after which you get charged 0.46p per MB (less than half a penny).
Are you in the UK or elsewhere in the EU?
EDIT to correct typo.