I bought a Three SIM with my new iPad from Apple. It cost £5. It was a 1gb/1 month card that should have expired yesterday but it's still working fine. In fact I'm browsing now using it. If I visit the Three page I get told "You don't have any allowance left to use". I haven't bought top ups. In fact I didn't register with Three and they don't have my details. Any ideas what's going on? Do I have the everlasting SIM card or is this just a normal thing? FWIW the sim had 750MB left on it yesterday, when it was still 'valid', because I'm only a light user of cellular data.