Apple's fourth-generation smartphone was a significant upgrade from the iPhone 3GS, starting with its 3.5-inch, 640 x 960 touchscreen, a much higher resolution than any previous iPhone has offered. It has a slimmer design and runs iOS 5.0, the latest version of Apple's operating system, on a 1 GHz Apple A4 processor. The iPhone 4 has a 5 megapixel rear-facing camera with a flash and support for recording 720p video at 30 frames per second. In addition, it includes a small front-facing camera for video chatting with an app called FaceTime. It's no longer the flagship smartphone from Apple, but is still sells well from AT&T, Verizon, and Sprint. Review Quick Specs Operating System: Apple iOS 5 Processor: 1 GHz Apple A1 Memory: 8 GB of Internal Storage Screen Resolution: 640 x 960 pixels Screen Size: 3.5 inch Keyboard Type: On-screen Communications: Bluetooth, CDMA, EVDO, GSM, EDGE, HSDPA, Wi-Fi, UMTS Meda Type: onboard memory Camera Resolution: 5.0 megapixels GPS: Yes Dimensions: 4.5 x 2.3 x 0.37 inches Weight: 4.8 ounces Release Date: 6/24/2010