Cannot Charge iphone 4s while it is "On"

Hi. i faced this problem where i cant even charge my iphone 4s while it is on.
All this while the iphone 4s works perfectly.
i) Last week, when i try to charge the phone (using my laptop), i realize that it wont charge.
ii) i try to clean the iphone charging port, with the idea that may be its too dirty/ dusty at the charging port. When i connect the charger to my iphone, it wont charged.
iii) Then, instead of connecting the USB cable to my laptop, i try to connect directly to the power plug, but it still wont charge.
iv) So i thought that may be the problem is the cable it self. So i went to Machines (Authorised Apple Products) and bought a new USB cable, However my iphone still wont charge.
So at night the battery is fully drained and empty, i try to connect the phone while it is OFF, and in the morning, when i wake up, the phone have been fully charged (100%).
So i thought the phone is ok now. When i reach at the office and try to charge the phone again, then i realize, my iPhone wont charge while it is on. it will only charge when it is off. i cant even restore it as my iphone cannot be connected to itunes while it is on.
Anyone having the same problem? Hope you guys can help.

Yes you can. Also, you can view the User Guide here http://manuals.info.apple.com/en_US/iphone_user_guide.pdf and you can go to http://www.apple.com/iphone/iphone-4s/specs.html

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