[stevew]

Data usage was not due to the browser, if you weren't actively browsing. A roaming BB will ALWAYS incur data charges...even if you don't receive a single message.

If you have apps that are polling every so often, that will also incur charges and if they're heavy on data, even more so. The browser icon will ALWAYS appear in the task switcher, as will the phone, message list, home screen and BBM. That's normal.