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说明你这个连接GSM模块正常，但是GSM往外通信不正常，应该是你的GSM模块是个模拟器？
百度试题 题目当对方挂断电话时,GPRS模块会返回下面哪个结果? A.ERRORB.NO CARRIERC.OKD.没有响应相关知识点: 试题来源: 解析 B 反馈 收藏
and in settings in cellular it keep saying “error” I have an Iphone 7 4 years ago 93 1 I can’t Update Carrier Settings My iPhone 7 suddenly has no service. It gives the popup that says I need to update my carrier settings, but when I try, it says there’s an unknown error...