Apple iPhone 3Gs 16GB Black
Battery Cell: Made from a 3.7 V 1220 mAh rechargeable lithium-ion polymer battery and 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 iPhone 3GS.
The main printed circuit board (PCB) in a system is also called a "system board" or "motherboard." This contains the CPU (central processing unit) which is responsible for carrying out programs and the RAM chip holding the random access memory. The PCB is made from fibreglass with copper tracks that transport the electrical signals. Fibreglass is used due to its thermal conductivity meaning the heat generated from the circuits doesn't compromise the integrity of the hardware in addition to its high strength to weight ratio.
The back of the iPhone 3Gs is made completely from ABS plastic as this boosts the strength of the GSM (Global System for Mobile Communications) signal. Acrylonitrile butadiene styrene or ABS is also useful as it is considered superior for its hardness, gloss finish, toughness, and electrical insulation properties. This model came in black or white.
Made from aluminium, a strong and malleable metal, it maintains the structure of the phone, improving its durability.
The LCD (liquid crystal display) display on the device was designed by Apple and made by LG with a pixel density of 163 pixels per inch (ppi) on a 3.5 in (8.9 cm) 480mm-by-320mm display
The enclosure holds the whole of the components in place vertically, made from plastic for durability

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