See How do I reset my message counter to clear, or zero? - BlackBerryFAQ
wrt first question.
On second question, seems when a media card is included with a new BlackBerry it is 2GN, if that's what you are asking. See What type and size Media Card can I use in my device? - BlackBerryFAQ
to maybe see your options. Posted via BlackBerryForums.com Mobile