Iphone(4 to 4S)

I have both 4 and 4, so I feel I have a say in the signal.

I didn't use the shell, just pinch it. After more than 30 observations,

The signal of 4 is never less than 4 s.

The conclusion is that unless you deliberately find fault, you won't think there is any signal problem with 4.

3。 Camera upgrade and antenna improvement are not important, the most important thing is.

1)4S is dual-mode, (of course, there is no cdma2000 in China, only TD-CDMA, so if you only use it in China, then ignore this).

2)4S supports Siri (you said you didn't escape from prison, so if you want to use Siri, you have to choose 4S. Apple 1 year will not let 4 support the unique function of 4S, and Siri will be published in Chinese next February. At that time, Unicom will definitely have a lot of advertisements, and you will regret it too late.

3) The software support cycle is long (the software update support for iphone3G is less than 2 years, and there is only one S for iphone3gs, but there is still software update until now, and the latest IOS5 can also be used on iphone3GS. In a few months, 3GS will be 4 years old, and every day 3GS is constantly refreshing the new record of Apple's software support period. If this is the case, Iphone4 can only be updated to IOS5 at most, and 4S is likely to be on IOS7. The most fundamental reason is CPU, which fundamentally limits the degree that software can achieve).