ive read that some ppl that buy the iphone with contract get charged for the data they used altho there is the free 500mb, 1gb and so on. how to avoid this? do i need to wait a certain period of time before i start using the internet. im on ivalue2, 1gb.

and also is there another way to turn off 3g/edge other than using bosspref? i plan not to JB my phone. thanks.