Last night I took my phone out of my pocket and all my contacts were gone. When I tried to import from the sim card, it would only just add one new contact each time I tried. with a message "Contacts Partially Imported". The selection also seams to be random, not alphabetical. How can I fix this? Or if not how can i delete old, unused contacts from sim to expedite the one at a time transfer? Also I have the screen unlock pattern set up to prevent accidental screen activity, so I don't even know how this happen.