为什么我的sim卡显示无服务器?突然无服务重启就好怎么回事?SIM卡无服务重启原因及解决方法探析
Why does my sim card show serverless? What's going on when there's no service all of a sudden and it just restarts? Analysis of the Reasons and Solutions for SIM Card Restart without Service
以上为机器翻译结果，长、整句建议使用 人工翻译 。