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)
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