iPhone 4 runs Apple’s iOS operating system, the same operating system as used on prior iPhones, the iPad, and the iPod Touch. It is mainly controlled by a user’s fingertips on the multi-touch display, which is sensitive to fingertip contact. It originally shipped with iOS 4. The latest version available is iOS 6.1.3 (March 2013).
The most noticeable difference between the iPhone 4 and its predecessors is the new design, which incorporates an uninsulated stainless steel frame that acts as the device’s antenna. The internal components of the device are situated between two panels of chemically strengthened aluminosilicate glass. It has an Apple A4 processor and 512 MB of DRAM, twice that of its predecessor and four times that of the original iPhone. Its 3.5-inch (89 mm) LED backlit liquid crystal display with a 960×640 pixel resolution is marketed as the “Retina display”.
In October 2011, the iPhone 4S was announced, which retains the same form factor but includes some upgrades such as the A5 processor, Siri, and an improved camera.
Apple and its partner carriers received 600,000 pre-orders for the iPhone 4 in the first 24 hours, the largest number of pre-orders Apple had received in a single day for any device up to that point. Engadget reported that at 20:30 UTC, all iPhone 4 pre-order suppliers had sold out. 1.7 million iPhone 4s were sold in its first three days of availability. If you need iphone 4 manual user to guide you the functions and features of your iPhone, see below.
iPhone 4 Manual User Guide for iOS 5.1
During Apple’s official unveiling of the iPhone 4S on October 4, 2011, it was announced that Sprint would begin carrying the reconfigured CDMA iPhone 4 and the iPhone 4S in the U.S. on October 14.