Help! Need Your Advice for Phone to Work

I have Samsung SGH-E105. I got it from T-Mobile in US. Before i traveled to China, I called T-mobile and unlocked the phone. Now, I am in Shanghai and purchased a SIM card from China Mobile. I put the card in the phone. I can see the network - CMCC and full strength. I can send text messages. However, I cannot make phone call. When I make a phone call, i see "Call Ended" on the screen. Please help!

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I dont think that the E105 is a world phone... that may be your problem... not sure though