Why does my iPhone 4S have no signal in China Mobile?

Why does my iPhone 4S have no signal in China Mobile? after I upgrade it to iOS 5.0.1. It works fine with iOS 5.0.0. Model Number is MC920LL.

But it is very strange, now it works fine with China Union, only not with China Mobile. As it was purchased in USA, its original network should be one of USAs. If it was locked again, it should not work with any other networks.

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    KiltedTim wrote:
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  • Why does my iphone have and enguged tone and can't receive any calls?

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