2013-01-25 15:01 - edited 2013-01-25 15:02
Definitely stereo. Check the headphone socket for any dirt. If that does not help, try a soft reset by shutting the phone down by holding both Power and Volume Down buttons pressed. If that doesn't help either, take your phone back to point of purchase for a replacement.
If i have helped at all a click on the white star below would be nice thanks.