When you are saying "unknown", do u mean when you call someone it shows up as unknown? If so, try this. Bring up your call log (just press the green send button). Press your trackwheel and go down to options. Go to general options and down to restrict my identity and make sure it is set to No. If that's not what u meant or that doesn't work, lemme know.
~via BB (wap.pinstack.com)~