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In pictures: Game changer - The iPhone then and now

From the original iPhone to the iPhone 4S, here's how Apple upped the ante on each iPhone model

  • iPhone touchscreens ... iPhone: 3.5 inches diagonally, 320 by 480 pixels iPhone 3G: 3.5 inches diagonally, 320 by 480 pixels iPhone 3G S: 3.5 inches diagonally, 320 by 480 pixels iPhone 4: 3.5 inches diagonally, 640 by 960 pixels (Retina display) iPhone 4S: 3.5 inches diagonally, 640 by 960 pixels (Retina display)

  • iPhone storage capacity ... iPhone: 128MB of RAM; 4GB, 8GB, and 16GB flash storage iPhone 3G: 128MB of RAM; 8GB and 16GB flash storage iPhone 3G S: 256MB of RAM; 8GB, 16GB, and 32GB flash storage iPhone 4: 512MB of RAM; 16GB and 32GB flash storage iPhone 4S: 1GB of RAM; 16GB, 32GB, and 64GB flash storage

  • iPhone cameras ... iPhone: 2-megapixel, still-only rear camera iPhone 3G: 2-megapixel, still-only rear camera iPhone 3G S: 3-megapixel, still-and-video rear camera, with autozoom and autofocus iPhone 4: 5-megapixel, still-and-video (720p) rear camera, with autozoom, autofocus and LED flash; 0.7-megapixel, still-and-video front camera iPhone 4S: 8-megapixel, still-and-video (1080p) rear camera, with autozoom, autofocus, LED flash, IR filter and image stabilizer; 0.7-megapixel, still-and-video front camera

  • The iPhone's evolution: 2007 to 2011 ... The wraps are now off the new iPhone 4S. But how does it compare to past models? Take a tour of each generation of iPhone and the capabilities it has brought to the mix: the processors, storage capacity, touchscreens, sensors and more.

  • iPhone sensors ... iPhone: Accelerometer, proximity, ambient light, microphone iPhone 3G: Accelerometer, proximity, ambient light, microphone iPhone 3G S: Compass, accelerometer, proximity, ambient light, microphone iPhone 4: Gyroscope, noise cancellation, compass, accelerometer, proximity, ambient light, microphone iPhone 4S: Gyroscope, noise cancellation, compass, accelerometer, proximity, ambient light, microphone

  • iPhone processors ... iPhone: 412MHz Samsung 1176 iPhone 3G: 412MHz Samsung 1176 iPhone 3G S: 600MHz Samsung Cortex-A8 iPhone 4: 800MHz Apple A4 iPhone 4S: 1GHz Apple A5

  • iPhone dimensions and materials ... iPhone: 4.8 ounces, 0.48 inches thick, aluminum and plastic shell iPhone 3G: 4.7 ounces, 0.48 inches thick, plastic shell iPhone 3G S: 4.8 ounces, 0.48 inches thick, plastic shell iPhone 4: 4.8 ounces, 0.37 inches thick, aluminum and glass shell iPhone 4S: 4.8 ounces, 0.37 inches thick, aluminum and glass shell

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