1、如果电话先打通了，然后突然出现拨打的电话正在通话中的提示音，那么就是被对方手动挂断了，如果直接听到电话正在通话中的提示音，那么就是对方真的在通话，可以挂断后等一会再次拨打，也有可能是对方信号不好或[详细]
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