phone. Not happy. But let's see if this works. INterestingly for the past few days when I would try to look at email it would tell me that it was unable to check messages as Bigpond was downloading. I have been turning on Airplane mode at night (obviously works) but who knows. Anyway, thanks to every one who has given their two cents. Let see if the replacement works. By the way, they said that the SIM needs to be returned as well. Is that fishy? In iOS4 the multitasking is really more of a "quick load" mode. Unless the phone is doing one of I think seven particular processes (including VOIP and "finishing a task") then the application is frozen, ready for rapid re-launch later. Only push data should really use up much downloads in iOS4. I had the exact same problem with Telstra. To cut a long story short, they couldn't figure out the problem for the overnight 1.4GB download. They just gave me credit and hoped it didn't happen again - which it hasn't. But I still live in fear that I'm going to be hit with another large bill. Now the long story, just for fun... I had been with Optus for 7 years when the iPhone 3G came out, and I was really happy with them - they were always willing to wave fees and send me new handsets. But once I got my new iPhone 3G ( bought out-right and unlocked from Telstra ),