# 9.1 How to enable hot-swap function of SIM card?

1. Ensure that the module’s SIM_PRESENCE pin has been connected.
2. Enable SIM card detection via AT command.

Example:
```
AT+QSIMSTAT=1 // Enable SIM inserted status report
AT+QSIMDET=1,1 or AT+QSIMDET=1,0 // Enable SIM card presence detection
```

When SIM card is pulled out or plugged in, the module will immediately respond:
```
+CPIN:NOT READY
+QSIMSTAT:1,0 or +QSIMSTAT:1,1
```

Call Ready

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- [Why certification must take a global approach](https://www.quectel.com/blog/global-device-certification/)
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- [RTK Correction Solution](https://www.quectel.com/gnss-rtk-correction-solution/)