If you have downloaded corrupted or incompatible Java midlets or other media,

If you have downloaded corrupted or incompatible Java midlets or other media,
  which are causing problems with the phone, try this
  *2767*JAVA# Java Reset and (Deletes all Java Midlets)
  *2767*MEDIA# Reset Media (Deletes All Sounds and Pics)
  *2767*WAP# Wap Reset
  *2767*CUST# Reset Custom EEPR0M
  *2767*FULL# Reset Full EEPR0M (Caution)
  For example : *2767*JAVA# would be keyed in as *2767*5282#
  Note : Not all codes will work with SGH-C100.