Re: GPRS mystery
Go into mobile network options and set data services to off. On a BlackBerry this will disable all data, including wifi, so you will need to turn it on when/if you want to use wifi.
I don't know what exactly is happening -- see what others say -- but your BlackBerry is making a data connection with the mobile network, and hence you are being charged.
Posted via BlackBerryForums.com Mobile