Notes From iFixit's iPhone 4S Teardown: 512 MB of RAM, New 3G Chip - MacStories
Apple iPhone 4s - Full phone specifications
Apple iPhone 4 White 16GB 512MB ROM Gsm Unlocked Phone Apple A5 Display 3.50-inch (640x960) Processor one-core Front Camera 0.3MP Rear Camera 5MP RAM 512MB Storage 16GB Battery Capacity 1420mAh OS iOS
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Apple iPhone 4 specs - PhoneArena
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