I used to get this years ago on an O2 pay as you go with old school crappy mobile internet. Can't remember exactly what sites triggered it, but it was something

I used to get this years ago on an O2 pay as you go with old school crappy mobile internet. Can't remember exactly what sites triggered it, but it was something pretty innocuous, perhaps gambling/lottery related. The switch from PAYG to contract made it disappear but it would be foolishly tin-foily of me to assume that this is exactly what O2 wanted to happen.