Unlock your cell phone for worldwide use.

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I think that if you stick with T - mobile for 30 days, it will show you how to unlock the phone, isn't that true? Because I want to bring my T - Mobile phone to China, and I need to get it unlocked. And then, I can get one of those Sim card from local, and install it in, so I can use it. Some people say, if I have AT&T phone, I must fulfilled their 2 years contract, and bring my phone to the local stores; and then pay around $10 to $20 to get one of their personnels to unlocked the phone. Does anyone have this experience for unlock your cell phone?