However, the 3GS continued in production until September 2012 when the i Phone 5 was announced.
Voice Over is a feature that dictates music details, system menus, text, and other things which was first introduced on the third generation i Pod shuffle.
Color inversion reverses the color scheme from black on white to white on black, while Text Zoom allows users to zoom into a text on the screen.
In addition to the i Phone 3G's Tri-band UMTS/HSDPA radio and quad-band GSM/GPRS/EDGE radio, the 3GS also adds support for 7.2 Mbit/s HSDPA allowing faster downlink speeds though upload speeds remain the same as Apple had not implemented the HSUPA protocol.
Other updates include the addition of a built-in Nike i Pod sensor which eliminates the need for an external sensor and allows native Nike i Pod support.
The i Phone 3GS retains the design of the 3G, with a glossy plastic back with tapered edges and metal buttons.
The 3GS has reflective silver text on the reverse side which matches the silver Apple logo, replacing the 3G's grey text.
The i Phone 3GS features an improved 3-megapixel camera manufactured by Omni Vision.
In addition to the higher pixel count, it also features auto-focus, auto white balance and auto macro and is capable of capturing VGA video.
The i Phone 3GS is powered by an internal 3.7 V 1220 m Ah rechargeable lithium-ion polymer battery and is designed to retain up to 80% of its original capacity after 400 full charge and discharge cycles.
A battery life indicator in percentage was also exclusive to the i Phone 3GS.
in Australia and Japan on June 26, and internationally in July and August 2009.