I have a Blackberry 8830 World edition smartphone (Verizon) . Till yesterday I had hundreds of contacts on it but suddenly I found yesterday afternoon, most of them have gone missing…I have now only 15 – these 15 all seem random, no pattern as to why they would be left behind…is there is any way to retrieve this data?

I don’t recall doing anything at all to cause this…have not even connected the phone to the computer for charging.
I never download stuff, have only 15-20 emails stored as I delete them from the BB constantly once I get them on my Outlook, no MMS or text and I did sync with the contacts manager but that was 2 months ago, I lost all these contacts just yesterday. Excessive data can never be the reason for this on my BB as I didn’t have anything except these few hundred contacts.