My iphone can not work on another carrier's network. What can I do?

A year ago, I buy an iphone and use in usual.
Buy after I upgrade to IOS5,it doesn't work any longer.
Someone say iPhones designed to work on AT&T's network will not work on another carrier's network.
Amazing! Before I upgrade to IOS5,it works on CMCC,and it can work any other carrier's network.
What can I do?

好吧，是广州人的话我用中文好了...
话说你的手机在升级之前是哪个版本的系统？越狱了么？一年前由 AT&T 发售的 iPhone 4 确实都是有锁的，除非越狱使用 Ultrasn0w 来解除网络锁，或者使用卡贴，而升级之后是会抹去越狱的东西的...

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My iphone can not work on another carrier's network. What can I do?

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