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have you disable any app? uninstall apps?
try this
settings > apps > all > camera > clear everything > restart your phone
Don't forget to give Kudos
Which software do you have in the phone? Android 4.0.4?
Then you should find the front camera if you open the camera > scenes/modes > front camera.
Hi uliwooly, yes I have Android 4.0.4. I was able to see the front camera icon already, but when I click(or choose) it, it takes picture using the primary(back) camera. I tried this option "Type this in ur dial pad *#*#7378423#*#*, go to service test and test the secondary cam ..see if its working" and I only see black screen.
Do you know what this means? 
In that case it sounds like you have to send your phone to service for examination. Please contact your local support for more information: