本教程适用于
产品型号：iPhone 12
系统版本：iOS 14.6
社展网，www.shezhan88.com
社展网，www.shezhan88.com
前述：
社展网，www.shezhan88.com
社展网，www.shezhan88.com
工具：
型号：iPhone 12
系统：iOS 14.6
软件：
功能和快捷键：
社展网，www.shezhan88.com
社展网，www.shezhan88.com
社展网，www.shezhan88.com
不一定，原因有很多。比如区域信号覆盖差、手机卡损坏、手机设置错误、手机卡接触不好等。信号覆盖较差的地区：尝试移至信号覆盖较强的地方。手机卡损坏：尝试更换其他手机卡。如果损坏，建议去营业厅更换。手机设置有错误：尝试恢复出厂设置，恢复出厂设置前请做好数据备份。建议尝试将手机系统固件升级到最新版本。
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