1. 输入AT指令 , AT+CIMI，查询IMSI，国际移动用户识别码（英语：IMSI，International Mobile Subscriber Identity），是用于区分蜂窝网络中不同用户的、在所有蜂窝网络中不重复的识别码。回复ERROR
[15:55:45.725]发→◇AT+CIMI
□
[15:55:45.739]收←◆
+CME ERROR: 14
2. 中间LOG输出如下
[16:02:44.032]收←◆
^CARDSTATUSIND: FF000000000000000000000000000000000000000000000000000000000000000
000000000000000000000000000000000000000000000000000000000000000000000000000000000
000000000000000000000000000000000000000000000000000000000000000000000000000000000
000000000000000000000000000000000000000000000000000000000000000000000000000000000
000000000000000000000000000000000000040000005A5A000000000000000000000000000000000
000
^SIMST:255,0
3. 看下AT指令说明，输出255表示SIM卡有问题。
原文：https://www.cnblogs.com/429512065qhq/p/13164533.html