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.
The master reset code is:
This will not delete anything from your
mobile phone, but set each and every thing to its
default/standard setting as it was on the time of purchase.
To unlock your phone put a sim from another company,
now type *#9998*3323# it will reset your phone. Push exit and then push 7,
it will reset