I am wondering if I have a defective blackberry. I have tried to format several cards in it and none have worked. I used to be able to listen to music off of it but now the device won't even read the card. When I use my 2gb card, it says "format failed". When I use my 4gb card, it locks up when I try to format. Anyone else have this issue? I bought the service plan but don't want to use it if it is something simple.