Recently, various blogs had reported that Singapore Operator M1 was about to launch iPhone 4S without camera. The reason for camera-less iPhone 4S is related to the military in that country. Singaporean military prohibits the use of mobile phones with cameras.
Enforcing the regulation imposed by military, M1 has removed the cameras from the iPhone 4S and is selling it without cameras. With the modifications, the iPhone 4S has now been approved for use.
Even iPhone 4 had also sold in Singapore without camera.
Such modification of iPhone 4S makes the warrantee on it invalid. At the moment, it is not known how Apple views these modifications.
Source: Gadget Venue