In October 2011, Apple released the iPhone 4S. Although its exterior and interior design are nearly identical to that of the iPhone 4 (released in June 2010), the iPhone 4S packs a lot of new hardware.
The iPhone 4S is available in 16GB, 32GB, and 64GB models. It comes in black or white. In the U.S., the iPhone 4S is available from AT&T, Sprint, and Verizon. When purchased with a two-year contract, a 16GB model costs $199, the 32GB model costs $299, and the 64GB model costs $399. I bought AT&T's version of the white, 16GB iPhone 4S (sans contract) from a local Best Buy Mobile location for $699.99 (plus tax).
Our the Apple iPhone 4S has an Apple A5 1GHz dual-core processor with 512MB of DDR2 RAM, 16GB of storage, 8MP rear-facing camera, VGA-quality front-facing camera, and 3.5" Retina display (960x640-pixel resolution at 326 ppi). It measures 4.5" (H) x 2.31" (W) x 0.37" (D) and weighs 4.9 ounces (0.1 ounces heavier than the iPhone 4).
Full teardown gallery: Cracking Open the Apple iPhone 4S
Cracking Open observations
- Different battery: The iPhone 4S has a 3.7V, 5.3Whr Li-ion Polymer battery, which has a different connector than the iPhone 4's 3.7V, 5.25Whr battery.
- Tamper-resistant pentalobe screws: Like Verizon's version of the iPhone 4 and the latest MacBook Airs, the iPhone 4S has two pentalobe screws along its bottom edge. You'll need a special screwdriver to remove them.
- iPhone 4 design (take two): The iPhone 4S' internal hardware layout is nearly identical to that of the iPhone 4. Their PCBs are roughly the same size and shape, as are the batteries, speakers, display/touchscreen assemblies, buttons, and dock connectors. Unfortunately, there are few, if any, interchangeable components. For example, the batteries have different connectors, and the speakers have different wires attached.
- A5 processor: The 1GHz dual-core Apple A5 processor (with 512MB RAM) is a step up from the iPhone 4's A4 chip. From their markings, both chips appear to have been manufactured by Samsung. According to Apple, the new processor provides "two times more power and up to seven times faster graphics" than the old chip.
- Twin antennas: The iPhone 4S has two cellular antennas. According to Apple, the phone will automatically switch between the two antennas to achieve the best possible call quality.
- World phone capability: Depending on which carrier you choose, the iPhone 4S can support the following cellular bands:
- UMTS/HSDPA/HSUPA (850, 900, 1900, 2100 MHz)
- GSM/EDGE (850, 900, 1800, 1900 MHz)
- CDMA EV-DO Rev. A (800, 1900 MHz)
- More storage: The least-expensive iPhone 4S has 16GB of storage. The least-expensive iPhone 4 has 8GB.
- Better camera: The iPhone 4S has an 8MP rear-facing camera, compared to the iPhone 4's 5MP camera. The iPhone 4S can also record video in 1080p HD at 30 fps.
To avoid damaging our test device, I decided against de-soldering the EMI shield which covers the RAM. Luckily, our friends over at iFixit did, and we have a fully hardware list thanks to their effort.
- 3.7V, 3.5Whr Li-ion Polymer Battery
- 1Ghz dual-core A5 processor and 512MB DDR2 RAM (K3PE4E400B-XGC1)
- Toshiba THGVX1G7D2GLA08 16 GB NAND Flash Memory
- Texas Instruments 343S0538 touchscreen controller
- STMicro AGD8 2132 KJSCH gyroscope
- STMicro 2128 33DH HGGBZ three-axis accelerometer
- Apple 338S0987 BOIT1132 SGP
- Qualcomm RT8605 Qualcomm RT8605 Multi-band RF Transceiver
- TriQuint TQM9M9030
- TriQuint TQM66052
- Unknown chip with markings SP f QHB52
- Avago ACPM-7181 Power Amplifier
- Skyworks 77464-20 Power Amplifier
- Apple 338S0973
- Qualcomm MDM6610
- Qualcomm PM8020 power management IC
- Murata SW SS1830010
Update 12/19/2011: This post originally appeared in our TR Dojo blog.
Bill Detwiler has nothing to disclose. He doesn't hold investments in the technology companies he covers.
Bill Detwiler is Managing Editor of TechRepublic and Tech Pro Research and the host of Cracking Open, CNET and TechRepublic's popular online show. Prior to joining TechRepublic in 2000, Bill was an IT manager, database administrator, and desktop support specialist in the social research and energy industries. He has bachelor's and master's degrees from the University of Louisville, where he has also lectured on computer crime and crime prevention.