# FPLMN

### **FPLMN Clearing & Modem Reset (AT Commands Guide)**

### **FPLMN (Forbidden PLMN List)**

This section explains how to:

* Check the contents of the FPLMN list
* Clear the FPLMN list when required

#### **1. Check FPLMN Contents**

To view the current forbidden network list stored on the SIM, use:

```
AT+CRSM=176,28539,0,0,12
```

**Purpose:**\
Retrieves the list of networks that the SIM is currently restricted from connecting to.

#### **2. Clear FPLMN (Forbidden Network List)**

To clear the FPLMN list, use:

```
AT+CRSM=214,28539,0,0,12,"FFFFFFFFFFFFFFFFFFFFFFFF"
```

**Purpose:**\
Removes all forbidden networks, allowing the device to attempt connection to previously blocked networks.

### **Modem Reset Using CFUN (Airplane Mode Toggle)**

#### **Turn OFF Airplane Mode (Disable RF / Reset Modem)**

```
AT+CFUN=0
```

#### **Turn ON Airplane Mode (Enable RF / Resume Operation)**

```
AT+CFUN=1
```

**Purpose:**\
Resets the modem’s radio stack and forces a fresh initialization.

### **Recommended Steps for IoT Device Reboot / Network Recovery**

Follow this sequence for best results:

1. **Clear FPLMN**

   ```
   AT+CRSM=214,28539,0,0,12,"FFFFFFFFFFFFFFFFFFFFFFFF"
   ```
2. **Restart the device**
3. **Reset the modem radio**

   ```
   AT+CFUN=0
   AT+CFUN=1
   ```

***

### **Expected Outcome**

* The modem performs a **fresh network scan**
* Previously blocked networks become available again
* Improved chances of successful network registration

***

### **Best Practices**

* Use this procedure when devices are stuck on **no service / limited connectivity**
* Especially useful after repeated failed network registration attempts
* Allow a few seconds delay between `AT+CFUN=0` and `AT+CFUN=1` for stability


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