Yes, you can put an iPhone camera in an iPhone 3GS provided you have the required skills.
iPhone 4: 5MP 720p HD Camera iPhone 3GS & Below: 3MP Camera
Depending on what iOS you have it varies, if both iPhone 4 and 3GS had iOS5 the only difference would be not having the switch camera button in the Camera App and FaceTime.
yes, but not all iphone 4 apps are available on the iphone 3gs/3g/2g becuase they are too high resolution apps, or need a front facing camera.
iPhone 2G = 2MPX iPhone 3G = 2MPX iPhone 3GS = 3MPX iPhone 4 = 5MPX
No, it does not. The first iPhone to have a front facing camera was the model that followed after the 3GS: the iPhone 4. The front camera was introduced as part of a new feature to FaceTime other iPhone owners, essentially introducing the prospect of video calling to the cellphone experience.
iPhone 4 has a range of improvements including high resolution screen, gyroscope, improved processor, 512MB RAM, 5 megapixel camera with flash and a front facing camera for video calling. ----------- iPhone 4 has better specs than 3gs. You can check some reviews on this site. (See the sources below)
no why do you think its called trading in?
No they are two different types of outer casing on the iPhones
No, Facetime is not compatible with any pre-iPhone 4 models. This is because it requires a front facing camera, and only the iPhone 4 and iPod Touch 4 have both a front facing camera and are Facetime supported.
iOS 5 will be compatible with iPhone 3GS as well as iPhone 4.
iPhone 3GS. Then the iPhone 4 and then the iPhone 4S.
RH The iPhone model that was released after the iPhone 3GS was the iPhone 4 in 2010. Here's a quick overview: iPhone 3GS - Released in 2009, this was the third generation iPhone. It added faster processing speeds, a 3 megapixel camera, and introduced video recording capabilities. iPhone 4 - Released in 2010 as the fourth generation iPhone. The iPhone 4 had a major redesign with a glass front and back, stainless steel edges, and introduced Retina display technology with a higher 960x640 resolution. Other new features included a 5MP camera, HD video recording, multitasking, and FaceTime video calling. iPhone 4S - The incremental update after the iPhone 4, released in 2011. The iPhone 4S introduced Siri voice assistant capabilities, an improved 8MP camera, and faster A5 processor. So in summary, the iPhone 4 with its completely new industrial design and several major hardware improvements was the next iPhone released after the 3GS model. The iPhone 4 represented a major leap forward for Apple's iPhone product line at the time.