The iPhone 4S has, however, gained a little weight (increasing from 137 grams to 140 grams), making the Galaxy S II the lightest phone in this comparison at 122 grams (4.3 ounces). The iPhone 4S From a functional standpoint, the major change is that the GSM-equipped iPhone 4 models support the EDGE "2G" mobile wireless standard as well as 3G networking (7.2 Mbps HSDPA support and HSUPA networks for compatibility with more cellular carriers worldwide). The iPhone 4 (CDMA) model, on the other hand, instead supports CDMA (EV-DO, Rev. The first major difference between the iPhone 4S and the iPhone 4 is the chipset and processor it uses. The iPhone 4S uses an improved A5 chipset that has a dual core processor running at 1Ghz. The processor of the iPhone 4 is able to operate at 1Ghz but is purportedly underclocked to just 800Mhz to save on power. Key Differences between iPhone 4 and iPhone 4S: The iPhone 4S has a Micro SIM access panel on the right side, but the iPhone 4 (CDMA) does not. The iPhone 4S has a faster camera with higher megapixel (8 vs. 5) and video shooting can be done at a higher resolution (1080p vs. 720p). The 4S also has 4 symmetrically positioned black strips (gaps between the antenna segments), 2 on each side, just like the CDMA 4. It also has a GSM slot, which is pretty much the only distinguishing feature between the CDMA 4 and the 4S. NOre.

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