But I don't know if the iPod supports Ad-Hoc WiFi mode.
I tested that offer last year, with a 3 PAYG SIM in an unlocked phone, but it seems to only work if you bought the phone from 3. They sniff the browser string. If you spoof the browser string it goes through a proxy and you get served web pages tailored to the spoofed device. Or something like that, I can't remember exactly, but it didn't work satisfactorily.