iPhone 4
6
The iPhone 4 features an additional front-facing VGA camera, and an improved 5 megapixel rear-facing camera integrated with an LED flash. The rear-facing camera is capable of recording HD video in 720p at 30 frames per second. Both cameras make use of the tap to focus feature, part of iOS 4, for photo and video recording. The rear-facing camera has a 5X digital zoom. The iPhone 4 introduces a gyroscopic sensor that enables 3-axis angular acceleration around the X, Y and Z axes, enabling precise calculation of yaw, pitch, and roll. The gyroscope complements the
Camera
Gyroscope and accelerometer
accelerometer, a sensor that has been present since the original iPhone, and detects the device's acceleration, shake, vibration shock, or fall by detecting linear acceleration along one of three axes (X, Y and Z). The combined data from the accelerometer and the gyroscope provides detailed and precise information about the device's 6-axis movement in space; the 3-axes of the gyroscope combined with the 3-axes of the accelerometer enable the device to recognize approximately how far, fast, and in which direction it has moved in space. The iPhone 4 is powered by the Apple A4 chip, which was designed by Intrinsity and, like all previous iPhone models, manufactured by Samsung. This system-on-a-chip is composed of a Cortex-A8 CPU integrated with a PowerVR SGX 535 GPU. The Apple A4 is also used in the iPad where it is clocked at its rated speed of 1 GHz. The clock speed in the iPhone 4 hasn't been disclosed; all previous models of the iPhone have underclocked the CPU which typically extends battery life and lowers heat dissipation. The iPhone 4 has 512 MB of eDRAM. The additional eDRAM supports increased performance and multi-tasking. The iPhone 4 uses a Micro-SIM card, which is positioned in an ejectable tray, located on the right side of the device. All previous models have used regular Mini-SIM cards. As on previous models, all data is stored in flash memory, 16GB
Processor and memory
Storage and Micro-SIM