Data usage on cell phone.

I have a Samsung Galaxy Android cell phone (hope that is the correct description) and I thought that I had about an $18 prepay balance. When I checked it had whittled down to $3.50 yet I had not used it for ages. I phoned 2 Degrees and the assistant there said that I had used my credit up by constant data updates updating my apps etc. He suggested that I change my settings to only makes these updates when near my wireless modem for my computer and that they would then be free. The updates apparently happen 24 hours a day unless you are connected exclusively to a wireless computer modem. Apparently too, the setting is automatically changed back when you add more prepay so one must rechange it to updating by wireless modem only, or you pay for the data used off your prepay account. This p----ed me off because no-one had explained that to me before. I hope that I have made this clear so that anyone else won't be caught out.[}]

We were caught out with an ordinary cell phone like this - got to be very expensive!