Currently Being ModeratedJan 26, 2013 9:35 AM (in response to Suriyafrombkk)
To answer your question, Restore the iPhone with current iTunes on your computer. If fixed, it was software. If still problem, most likely hardware, and then make Genius reservation or set up Service and take or send to Apple for resolution under Warranty.
Currently Being ModeratedJan 26, 2013 8:27 PM (in response to brad805)
Still have problem so it mean cause from hardware.
I think this problem should not happen if apple have QC process and I knew apple have warranty but process 7 days.
Thank you for reply.