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    Help no outgoing call with different GSM operators

    Hi, I am new to android phone. Recently I got a motorola atrix 4g (android 2.3.4, rooted) from USA and unlocked it. I tried two different GSM operators. From one GSM operator (Vodafone), I can make and receive calls. From other GSM network, I can receive calls, able to use 2G gprs, but not...