'Evening I've got a 64GB iPad 3G and on Monday I cut up an O2 Pay-as-you-Go SIM to put in it. It's the one where if you topup by £10 a month you get 300 texts and "unlimited" internet. It's been working perfectly, well apart from O2's rubbish 3G coverage and slow speeds - but on a par with my iPhone 3GS. Anyways, I've just plugged it into iTunes and got this: Learn more takes me to http://support.apple.com/kb/HT1970?viewlocale=en_US Anyone else had this? On my iPad I just went to Settings > Cellular Data > APN Settings, and all of APN, Username & Password are blank currently. So yeah, any ideas? Hope it's not O2 about to block my SIM!