iPhone 4S

iPhone 4S runs iOS, Apple's mobile operating system.iPhone 4S was first shipped with iOS 5, which was released on October 12, 2011, 2 days before the release of the device. The 4S uses iOS 5.1.1, which was released on May 7, 2012. As of September 2015, the device can be updated to iOS 9.

Review of iPhone 4S

Battery: 1432 mA
Power: 5.3 Whr

iPhone 4S

Voltage: 3.7 V

Bluetooth: 4.0

Camera:

Front: 0.3 megapixels / 480p30 video
 Rear: 8.0 megapixels / 1080p30 video

Network:Up to HSDPA (14.4 Mbps)+HSUPA (3G), EV-DO Rev. A (3G)

Colors: Black/White

CPU:

Core Design: ARM Cortex-A9 x 2
CPU: S5L8940 "A5"
CPU Speed: 800 MHz

Instruction Set: ARMv7

Firmware:

Initial firmware: 5.0 (9A334)
Latest publicly available firmware: 9.3.5 (13G36)
Latest firmware: 9.3.5 (13G36)
Internal Name: iPhone4,1

RAM: 512 MB

ROM: 8/16/32/64 GB

Wi-Fi: 802.11b/g/n (2.4 GHz only)