Simple this one,
Just text SIM to 65666
I got this via flyer in my last online DVD rental delivery film, inside the pack. (American Gangster Top Flick !!)
Get a free sim card which gives you 500 txts and 150 free minutes per month if you top up £15.00
Which Is, lets face it peanuts for most pay as you go users.
Obviously its a txt deal not online or offline, just had to pick something to submit the deal