iPhone 4S ：
- A low voltage Apple A5 CPU (it won’t be the same as the iPad 2 chip, clock for clock).
- Updated front and back camera sensors. FaceTime HD in the front, 8-megapixel 1080p HD video recording in the back.
- Multiband 3G Qualcomm chipset — North American & International GSM/UMTS/HSPA bands for AT&T and Global carriers, North American CDMA & International GSM/UMTS/HSPA bands for Verizon and Sprint.
- NFC support.
- Metal or “premium” plastic on the back case.
- Faster CPU.
- Larger 4-inch screen, similar to LG’s NOVA display but with a higher resolution.
- 1GB of RAM.
- Slightly larger design overall, but thinner and with a larger battery.
- 32GB of storage.
- iPhone 5 exclusive software and APIs (Assistant).
- Dedicated Assistant button, possibly integrated with the new home button, “think gestures or a two-stage button like a camera shutter key).